In regard to the Ick problem with the sailfins, I've found the best way to rid a tank of ick and to keep it gone is by the use of a cleaner shrimp. The cleaner shrimp also are very entertaining to watch as they jump on the "DIRTY FISH" to clean them. My Sailfin is about 7" and he goes every couple of days for a cleaning. Also on the Ick matter, just be careful of medicene if there are any inverts in the tank, It will kill 'em. UV Sterilizers are said to also help but that's on this recent college grad's wish list.