Very helpful, thank you!!!!Often, these fish come from the Ocean into the LFS within a few days. Depends on the LFS and where they buy from. I know it's a pain in the rear end but I learned my lesson the hard way unfortunately... I used to do the same thing and only bought healthy looking fish. But Ich can hide itself pretty well. I brought home 3 Firefish and within a week all my tangs had Ich all over them. The Firefish brought it and died within a few days. I had to set up a tank in my sump room as a hospital tank to treat and keep my Tangs and other fish alive. HOB filter, heater, and a power head. All stuff I already had sitting around. I was able to save everything but my Anthias, as they don't seem to do well in copper (for me anyways...) I decided to do a long fallow period to get rid of the Ich in my display tank. It suuuked.
I put 2 small plastic tubs with some fine sand in the QT tank for wrasses, and also some PVC pipes for fish to hide out in. It works for me, as I never want to have to rip my tank apart again to remove all of the fish. It's a good piece of mind knowing that anything I add to my expensive collection of animals won't get them all sick. I'm lucky as I have the room for it though...