High Quality Content by WIKIPEDIA articles! The scopas tang or twotone tang (Zebrasoma scopas) is a marine reef tang in the fish family Acanthuridae. They may live at water depths of 1 - 60 m (3 - 200 ft) or more. The fish grow to a maximum length of 40 cm (15.8 in). Zebrasoma scopas is found in throughout Oceania. Zebrasoma scopas is a highly popular fish in the aquarium trade. They are herbivorous fish specializing in filamentous algae.