{"title":"Upcycled Glass Fish Caves","description":"\u003cp\u003e\u003cspan\u003eIntroducing our collection of artisanal hiding spots for fish who want to avoid their fishtank paparazzi. These handmade glass aquarium caves are the perfect sanctuary for your aquatic divas to retreat to when they need a break from the spotlight. Your fish will thank you for the added privacy and the opportunity to indulge in a bit of underwater seclusion.  Each cave is unique and made from upcycled glass.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"aquarium-fish-cave-16","title":"Small Aquarium Fish Cave","description":"Ready to Ship! This is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eItem Width: 4 in\u003cbr data-mce-fragment=\"1\"\u003eItem Depth: 4 in\u003cbr data-mce-fragment=\"1\"\u003eItem Height: 1.5 in\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43260311830683,"sku":"101312","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/aquarium-fish-cave-813134.jpg?v=1677466515"},{"product_id":"aquarium-fish-cave-19","title":"Aquarium Fish Cave","description":"","brand":"GBU","offers":[{"title":"Default Title","offer_id":43260312780955,"sku":"101314","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/aquarium-fish-cave-681799.jpg?v=1768796243"},{"product_id":"aquarium-fish-cave-20","title":"Small Aquarium Fish Cave","description":"Ready to Ship! This is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eItem Width: 4 in\u003cbr data-mce-fragment=\"1\"\u003eItem Depth: 4 in\u003cbr data-mce-fragment=\"1\"\u003eItem Height: 1.5 in\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43260313600155,"sku":"101315","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/aquarium-fish-cave-866919.jpg?v=1768796369"},{"product_id":"aquarium-fish-cave-22","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  4 1\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616318718107,"sku":"101601","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-736305.jpg?v=1696451306"},{"product_id":"aquarium-fish-cave-23","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  3 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight 1 1\/2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616334774427,"sku":"101602","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-139037.jpg?v=1696451420"},{"product_id":"aquarium-fish-cave-25","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  4 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616347521179,"sku":"101604","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-409324.jpg?v=1696451417"},{"product_id":"aquarium-fish-cave-32","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  5 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  4 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eHeight 1 inch\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616407158939,"sku":"101612","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-869005.jpg?v=1696451414"},{"product_id":"aquarium-fish-cave-35","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth: 4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  4 1\/4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616421347483,"sku":"101615","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-727666.jpg?v=1696451423"},{"product_id":"aquarium-fish-cave-37","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  3 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight 1 inch\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616506773659,"sku":"101617","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-428650.jpg?v=1696451416"},{"product_id":"aquarium-fish-cave-39","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  4 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  4 1\/4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 inch\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616524009627,"sku":"101619","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-672047.jpg?v=1696451417"},{"product_id":"aquarium-fish-cave-44","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  3 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  2 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/4 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616573259931,"sku":"101624","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-727650.jpg?v=1696451416"},{"product_id":"aquarium-fish-cave-45","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  4 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  4 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/4 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616586432667,"sku":"101625","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-530815.jpg?v=1696451414"},{"product_id":"aquarium-fish-cave-46","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  4 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  4 inches\u003c\/p\u003e\n\u003cp\u003eheight:  1 inch\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616591347867,"sku":"101626","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-368727.jpg?v=1696451420"},{"product_id":"aquarium-fish-cave-48","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  5 1\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 3\/4 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616595607707,"sku":"101628","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-148635.jpg?v=1696451414"},{"product_id":"aquarium-fish-cave-49","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  3 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/4 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616598491291,"sku":"101629","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-359228.jpg?v=1696451422"},{"product_id":"aquarium-fish-cave-50","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  4 inches\u003c\/p\u003e\n\u003cp\u003e Depth:  3 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616602357915,"sku":"101630","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-270463.jpg?v=1696451417"},{"product_id":"aquarium-fish-cave-51","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  3 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616608092315,"sku":"101631","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-619371.jpg?v=1696451682"},{"product_id":"aquarium-fish-cave-54","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  3 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/4 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616612876443,"sku":"101634","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-549518.jpg?v=1696451682"},{"product_id":"aquarium-fish-cave-56","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth: 3 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 \/2 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616618414235,"sku":"101636","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-404438.jpg?v=1696451682"},{"product_id":"aquarium-fish-cave-60","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth:  3 1\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616626540699,"sku":"101640","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-921095.jpg?v=1696451683"},{"product_id":"aquarium-fish-cave-62","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth: 4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 3\/4 inches\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHeight:  1 1\/2 inches\u003c\/p\u003e\n\u003cbr\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616630702235,"sku":"101642","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-850962.jpg?v=1696451681"},{"product_id":"aquarium-fish-cave-63","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth: 3 3\/4 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 1\/4 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43616634372251,"sku":"101643","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-733653.jpg?v=1696451683"},{"product_id":"small-aquarium-fish-cave-11","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks.\u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003eWidth: 4 1\/2 inches\u003cbr\u003e\u003cbr\u003eDepth: 4 inches\u003cbr\u003e\u003cbr\u003eHeight: 1 inch\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43633028530331,"sku":"101668","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-417243.jpg?v=1696699534"},{"product_id":"tiny-aquarium-fish-cave-2","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth: 3 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43635399622811,"sku":"101664","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-236691.jpg?v=1702925522"},{"product_id":"small-aquarium-fish-cave-16","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks.\u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003eWidth: 3 3\/4 inches\u003cbr\u003e\u003cbr\u003eDepth: 3 1\/2 inches\u003cbr\u003e\u003cbr\u003eHeight: 1 1\/4 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43635417415835,"sku":"101662","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-173461.jpg?v=1696699529"},{"product_id":"small-aquarium-fish-cave-20","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks.\u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003eWidth: 4 1\/4 inches\u003cbr\u003e\u003cbr\u003eDepth: 4 inches\u003cbr\u003e\u003cbr\u003eHeight: 1 1\/2 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43635484000411,"sku":"101656","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-698004.jpg?v=1696782867"},{"product_id":"small-aquarium-fish-cave-22","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks.\u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003eWidth: 4 3\/4 inches\u003cbr\u003e\u003cbr\u003eDepth: 4 1\/4 inches\u003cbr\u003e\u003cbr\u003eHeight: 1 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43635503693979,"sku":"101654","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-128317.jpg?v=1696782867"},{"product_id":"tiny-aquarium-fish-cave-5","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWidth: 3 1\/2 inches\u003c\/p\u003e\n\u003cp\u003eDepth:  3 1\/4 inches\u003c\/p\u003e\n\u003cp\u003eHeight:  1\/2 inch\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43635556647067,"sku":"101651","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/tiny-aquarium-fish-cave-345557.jpg?v=1696782926"},{"product_id":"small-aquarium-fish-cave-25","title":"Small Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks.\u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. I have also had luck partially burying them in the substrate and letting the fish dig them out as they see fit.\u003cbr\u003e\u003cbr\u003eWidth: 3 3\/4 inches\u003cbr\u003e\u003cbr\u003eDepth: 3 1\/2 inches\u003cbr\u003e\u003cbr\u003eHeight: 1 inches\u003c\/p\u003e","brand":"GBU","offers":[{"title":"Default Title","offer_id":43635584729243,"sku":"101649","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0421\/8804\/6491\/products\/small-aquarium-fish-cave-415850.jpg?v=1696782867"},{"product_id":"tiny-aquarium-fish-cave-9","title":"Tiny Aquarium Fish Cave","description":"\u003cp\u003eThis is an aquarium-safe fish cave made from an upcycled glass bottle. The bottle is carefully broken into pieces, arranged to form a random pattern and fused back together flat in a kiln. The piece is then fired a second time to create the domed shape. The cave is then cleaned of any residue from the kiln and any remaining sharp edges are carefully filed down to make it safe for the fish. You may see scuff marks on this item. I hand polish any rough edges that remain after firing to make sure it’s as safe as possible for your fish. These marks will not be visible once the piece is underwater.\u003cbr\u003e\u003cbr\u003eI use these in my own fish tanks. Because they are glass, they're easy to clean and sanitize if you move them between tanks. \u003cbr\u003e\u003cbr\u003eNot all fish will use this type of shelter, but often I find plecos and other dark-loving catfish will use them. Small cichlids will also use them for spawning. I've seen Apistogramma and small African cichlids defend them as spawning territories. 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