Convict Tang (Acanthurus triostegus)
The Convict Tang is a distinctive surgeonfish named for its pale whitish-gray body marked with six vertical black stripes, resembling a classic prison uniform. Native to the Indo-Pacific, it is commonly found in large, active schools across shallow reef flats, lagoons, and surge zones. Unlike many tangs, it is more peaceful and highly social, often engaging in group grazing behavior. As an herbivore, it plays a key role in maintaining reef health by controlling turf algae and promoting coral growth. Its hardiness, active behavior, and relatively peaceful nature make it a great choice for larger community reef tanks.
 
Size: Up to 8 inches (20 cm)
Tank Size: Minimum 125 gallons (space needed for swimming and potential schooling behavior)
Care Level: Easy to Moderate (generally hardy and adaptable)
Diet: Herbivore – primarily grazes on turf algae; supplement with seaweed, spirulina, and algae-based foods
Aggression Level: Generally peaceful – can be kept in groups; minimal aggression compared to other tangs