another intresting tid bit that seatrueblue was alluding to is having a bare bottom QT tank. Apparently the cyst form of the parasite does not like the hatching conditions on a ultra smooth surface. This was observed by a fish breeder who's live stock he housed in cement breeding tanks would always get ich and the ones he housed in bare glass and fiber glass would not. Once again, not a cure but just something to assist the healing. It also makes it easy to siphon out the cyst form of the parasite in the morning off the clean glass.