Originally Posted by
emporer angel
so in my fish only DT, if i treat with copper for six weeks, my tank can still have ich?
The only way to ensure an ich free environment is to leave your DT empty of fish for 6 weeks. The reason being is using copper and other meds MIGHT kill the ich, but you will never no for sure. Leaving your tank fishless for 6 weeks will rid your tank of ich because ich needs a host to survive. If there is no ich, whatever ich is in your tank will go through it's life cycle and then die. As far as QT fish for three weeks, I have decided to move that up to at least four weeks and with my Blue Hippo Tang coming in soon I'm going to Hypo immediatley as if he did have ich, just to be sure.