Does anybody here keep Powder Blue Tangs? It is said that they are high maintainence fish, and also that their care level is difficult. They are said to be prone to Ick, and agressive towards other fish in the tank. Is Ick the main concern when keeping this fish? I have mine housed in a 120 gallon 5ft. X 18" W X 26" T. It was said that the bigger the tank the less problems will occur when keeping this fish. Everybody please jump in on this if you have them, or have kept them. Thanks.