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FritzZyme 7 leaving brown flakes in tank

John Zoidberg

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So I'm cycling my quarantine tank and I added FritzZyme 7 along with an established sponge filter. After I added the Fritz and came back a couple of hours later i noticed brown stuff on the bottom of the tank and the PVC pipe I added for the fish. When I added Fritz in my main tank it had substrate so not sure if it did it then too. So is this normal or did i do something wrong.


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