This is the worst product I have ever bought. I have had the same fish for 3 years with no problems and as soon as I started using these stones my fish got sick and was shaking constantly. The color does not stay on the stones and is difficult to clean. If you want to kill your fish fast buy this. otherwise I would have avoided it at all costs. And in less than a week my fish will be dead. I've been eating fish for 3 years. The only change I made was using these stones
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