Powder Blue Tang - Acanthurus leucosternonPowder Blue Tang (Acanthurus leucosternon) The Powder Blue Tang is one of the most recognisable surgeonfish in the marine hobby, prized for its vivid powder blue body, bold black facial mask, crisp white breast and bright yellow dorsal fin. Native to the Indian Ocean, it inhabits shallow, clear coral reefs, especially reef flats and upper seaward slopes, where it grazes benthic algae either singly or in feeding groups. In aquaria it is an active, high