I think that killed my beta fish. The last year in our aquarium he felt fine. After we switched to this, our beta developed fin rot very quickly and declined quickly. Very sad about this as he used to be super healthy and energetic and after that he just started lying on the bottom of the aquarium. We've done regular water changes and cleaned the tank thoroughly (a lot of pink slime formed after the change) and followed the directions on the box to no avail. Poor fish :(
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