I was wondering the same thing. I did QT all my fish and treated with malachite green and prazipo for 2 weeks. Then my heater went and they still got ich. ? So I was thinking it was on the live rock or something.So you guys think if you leave your DT free of fish for 76 days QT your fish then put your fish back in the DT it's impossiable for them to get ich again?


