This product quickly fell out of favor. That used to be my favorite pastime. I treat many quarantined marine fish with copper. Using the Hanna Copper Checker, I have found that by following the directions on the bottle, 1.13 to 5.0 ppm copper can be obtained. Much more than 2.5 becomes lethal for many fish. Fritz denies any wrongdoing, does not admit intermittent potency, it's all over the forums. Buy CopperPower, it's a stable copper chelate that really works at the right dosage and is tested at the right dosage. As well as cupramine, cuprion and several other chelated and non-chelated copper products. DO NOT buy this to treat your fish. You will end up poisoning your fish or causing cloudy water, eye damage and permanent internal damage to your fish if you find you have severely overdosed. If it were possible I would give zero stars.
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