These stones have been added to the built-in tank. I've had this tank for almost a year. I have rinsed the stones over 4 times and conditioned the water on the final rinse. All other items were added last week. After adding stones today the fish was dead when I checked 4 hours later. DO NOT BUY!. The photo shows that most of them stuck to the entrance filter after they died. I am so disappointed. I have been in this hobby for over 25 years and have never seen a product that does this. I would give 0 if I could. UPDATE: I was waiting for an answer to resolve the issue before posting this. A few days after this devastation, I went to clean up the bucket and found this weird reflective residue at the bottom of the bucket. I have rinsed and rinsed this stone at least 4 times now before adding it to my fully formed bare bottomed aquarium. I have no doubt that my fish died because of this gravel. I feel like I should be reimbursed for the two bags and the gravel and all the adult fish I lost. This summer I wanted to breed my neon tetras but they are gone now because of this gravel.
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