In your post on the fish discussion board it sounds like they have ich. When my Perc had ich he quit eating and lost a lot of weight. I immediately set up a QT tank and started doing hyposalinty. He didn't eat for about another 3 days, but has since started eating well again, gained back all of his weight, and the ich is gone. I had heard that the hypo makes their metabolism higher, so I started feeding hime twice a day and this seemed to help. Good Luck!