Powder Brown TangAcanthurus Nicgroens Care: Intermediate Diet: Algivorous Light: Medium Place of origin: Indian Ocean Powder Brown Tang Southern Indonesia, ranging from Sumatra to west Flores and rare in Cocos and Christmas Is., eastern Indian Ocean, where the Indian Powderblue Surgeonfish is common. Found mainly around rocky reefs subject to strong currents and occurs alone or in small groups. Acanthurus cf leucosternon is best distinguished from Acanthurus