<a href=showthread.php?s=&postid=11871851#post11871851 target=_blank>Originally posted</a> by DamnPepShrimp
If your fish has ich, you'll want to remove all the fish and QT them for about 6 weeks while you leave your display fishless to starve and kill the ich.
Before you decide to do this take a look at all the forums debating the different viewpoints on addressing an ich problem.
In my experience, i've never had to do this. my tank has "had" ich in the tank for years and i rarely, if ever, get ich breakouts anymore.
Yes, I quarantine new fish and treat with copper before adding to a display, but if/when adding new fish, stress can sometimes cause a breakout at that point. I just treat with fresh, crushed garlic, 2 cloves for my 170 gal system, daily, for a week, and then every other day for a week. Works wonders.
if your fish isn't eating/swimming, it may be too late, though.
IMO, trying to rid a tank of ich is futile. IMO, better to treat it as it happens.