I've kept tanks for 40 years and have never encountered what amounts to a bad bacteria in these rocks, that once isolated from oxygen will produce hydrogen sulfide gas in your tank. Rinse all you want, it will only activate this bacteria. Once in the tank, it soon clouds the water, fish become listless, then paralyzed. A devastating, fatal disaster!! These poor fish. This awful company!!

I've kept tanks for 40 years and have never encountered what amounts to a bad bacteria in these rocks, that once isolated from oxygen will produce hydrogen sulfide gas in your tank. Rinse all you want, it will only activate this bacteria. Once in the tank, it soon clouds the water, fish become listless, then paralyzed. A devastating, fatal disaster!! These poor fish. This awful company!!

Attention Fish Parents: Do not buy these rocks if you want your fish to live. I recently purchased these rocks to replace the old ones in my tank. In my tank I have four goldfish and an albino bristlenose pleco. My fish have been used to the water changes I do and have always been fine after I’ve done it. When I was switching out the rocks I also did a water change. Unfortunately less than 24 hours after, all my fish were dead. Normally they are fine with the water changes and are pretty hardy fish. If my one fish can survive jumping out of the tank he can handle a little water change. The only difference I could after the water change was the new rocks. After reading reviews of this product, which I wish I would’ve done sooner, I realized that other people have gone through the same problems as I have. So to protect your fish please do not purchase these rocks!!

Attention Fish Parents: Do not buy these rocks if you want your fish to live. I recently purchased these rocks to replace the old ones in my tank. In my tank I have four goldfish and an albino bristlenose pleco. My fish have been used to the water changes I do and have always been fine after I’ve done it. When I was switching out the rocks I also did a water change. Unfortunately less than 24 hours after, all my fish were dead. Normally they are fine with the water changes and are pretty hardy fish. If my one fish can survive jumping out of the tank he can handle a little water change. The only difference I could after the water change was the new rocks. After reading reviews of this product, which I wish I would’ve done sooner, I realized that other people have gone through the same problems as I have. So to protect your fish please do not purchase these rocks!!

Never received my order/ never received any customer service no response from my emails

Ordered and delivered promptly as store didn’t have enough inv on hand for my new system

Very sharp granules I would not recommend this product.

Very sharp granules I would not recommend this product.