John Zoidberg Posted October 22, 2021 Share Posted October 22, 2021 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. Link to comment Share on other sites More sharing options...
T. Payne Posted October 22, 2021 Share Posted October 22, 2021 While I have not used specifically Fritz, I have used several other brands of nitrifying bacteria, and I have had the same results. I would not be concerned about it. 1 Link to comment Share on other sites More sharing options...
amr427 Posted October 27, 2021 Share Posted October 27, 2021 I have been using Fluval Cycle Biological Enhancer, which I believe is similar to Fritz 7, to cycle my quarantine tank and have similar results. 1 Link to comment Share on other sites More sharing options...
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