Acanthurus leucosternon - The Powder Blue Tang is an extraordinarily beautiful fish. These fish are baby blue in color with a bright yellow dorsal, white ventral and anal fins, black face with white markings, and large eyes. Once established, these fish do very well in an established tank with lots of live rock and swimming room. Keep only one per tank. They are voracious algae eaters that do well in fish only or reef tanks, as long as there is plenty of live rock to pick at. They can become aggressive towards other tangs as they grow larger.