Convict Tang - Acanthurus triostegus
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The Convict Tang (Acanthurus triostegus), also known as the Convict Surgeonfish, is a striking and active reef fish recognized for its bold black stripes on a pale body. Hardy and social, this species is ideal for larger marine aquariums and brings constant motion and grazing activity to the tank.
Common Name: Convict Tang, Convict Surgeonfish
Scientific Name: Acanthurus triostegus
Family: Acanthuridae
Size: Up to 10 inches (25 cm)
Temperament: Semi-aggressive
Difficulty: Easy to Moderate
Reef Safe: Yes
Native Region: Found throughout the Indo-Pacific, including Hawaii, Indonesia, and the Great Barrier Reef, typically inhabiting reef flats, lagoons, and shallow surge zones.
Tank Size: Minimum of 100 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate/Decor: Live rock with open swimming space; provide grazing areas with algae-covered surfaces.
• Diet: Herbivorous—feeds on algae, supplemented with seaweed sheets, spirulina flakes, and other plant-based foods.
• Behavior: Active and social; may establish pecking order when kept in groups, especially in smaller tanks.
• Tankmates: Compatible with most semi-aggressive reef fish; avoid very small or timid species that may be stressed by its grazing and activity.
• Care Notes: Requires a well-established tank with plenty of algae for grazing; strong water flow and stable water quality help maintain health and coloration.