Chocolate Surgeonfish, Acanthurus pyroferus
The Chocolate Surgeonfish, (Acanthurus pyroferus), is a species of Tang from the Indo-Pacific (excluding Hawaii) and is found primarily around steep shallow slopes near the coast with clear sand and hard corals.
This species grows to about 10 inches long. It is sometimes known the Mimic Tang as an aquarium fish because of the juveniles striking coloration that resembles that of the Pygmy Angelfish. It is generally a shy fish in the aquarium and is usually seen alone and occasionally in small groups.
Like all surgeonfish, this is a grazer and an opportunistic eater (exploiting chances offered by its immediate environment and circumstances). However, it primarily feeds on benthic algae.
Image Credit: Brian Gratwicke/Wikipedia (CC 2.0)