Chocolate Mimic Tang - Acanthurus pyroferus

The Chocolate Mimic Tang (Acanthurus pyroferus), also known as the Chocolate Tang, is a fascinating reef fish that exhibits a remarkable color transformation from juvenile to adult. Juveniles display a bright yellow body with a dark tail and face, while adults develop a muted brown or chocolate coloration. This species adds both color and activity to marine aquariums and is highly prized by hobbyists for its unique appearance. 

Description:

Common Names: Chocolate Mimic Tang, Chocolate Tang

Scientific Name: Acanthurus pyroferus

Family: Acanthuridae

Size: Up to 10 inches (25 cm)

Temperament: Semi-aggressive

Difficulty: Moderate

Reef Safe: Yes

Native Region:

Widespread throughout the Indo-Pacific, including Indonesia, the Philippines, and northern Australia, typically inhabiting lagoons and reef slopes.

Aquarium Setup:

Tank Size: Minimum of 75 gallons

Temperature: 74–80°F (23–27°C)

pH: 8.0–8.4

Salinity: 1.023–1.025

Substrate: Live rock aquascape with open swimming areas; juveniles benefit from areas to hide and forage.

Additional Tips:

• Color Transformation: Juveniles are bright yellow with contrasting dark markings; adults develop chocolate-brown coloration.

• Diet: Herbivorous—primarily consumes algae; supplement with high-quality marine algae sheets, spirulina, and vegetable-based pellets.

• Behavior: Semi-aggressive; may defend territory, especially in smaller tanks.

• Tankmates: Compatible with most reef-safe species; provide plenty of swimming space to reduce territorial behavior.