Half Black Tang (Acanthurus tristis)

The Half Black Mimic Tang (Acanthurus tristis) is a fascinating and visually appealing tang species, known for its ability to mimic the appearance of dwarf angelfish—particularly the Half Black Angelfish (Centropyge vrolikii)—during its juvenile stage. As it matures, the tang retains a rich brown-to-black colouration towards the front half of its body, with a creamy to golden rear, creating a bold contrast. Native to the Indian Ocean, this peaceful herbivore is well-suited for reef aquariums where its algae-grazing habits support tank cleanliness.

Key Features:

• Scientific Name: Acanthurus tristis
• Common Name: Half Black Mimic Tang, Indian Mimic Surgeonfish
• Size: Typically grows up to 8 inches in length
• Diet: Herbivorous; thrives on a diet rich in marine algae, seaweed, and spirulina-based foods
• Temperament: Peaceful to semi-aggressive; generally calm but may show territoriality towards similar tangs
• Habitat: Ideal for reef and fish-only tanks with live rock and swimming space
• Care Level: Moderate; suitable for aquarists with some marine experience

Why Choose the Half Black Mimic Tang (Acanthurus tristis)?

The Half Black Mimic Tang is a wonderful choice for aquarists who want a peaceful, reef-safe tang that offers both aesthetic appeal and practical function. Its juvenile mimicry of angelfish is a fascinating natural behaviour, and even as adults, their striking bicolour pattern remains eye-catching. This species is less aggressive than many other tangs, making it ideal for community reef systems.

Care Tips:

• Water Parameters: Keep stable water conditions with a temperature of 75°F – 80°F (24°C – 27°C), pH between 8.1 – 8.4, and salinity at 1.023 – 1.025. Maintain high water quality through strong filtration and regular water changes.
• Feeding: Provide a diet rich in marine-based algae, seaweed sheets (nori), spirulina flakes, and high-quality herbivore pellets. Supplement with occasional frozen mysis or brine shrimp. Feed 2–3 times daily.
• Tank Setup: A tank of at least 100 gallons is recommended. Include plenty of live rock for grazing and hiding, as well as open areas for swimming.
• Behaviour: Generally peaceful, especially when introduced to the tank at a smaller size. May become mildly territorial with other tangs, particularly those of similar body shape. Best housed singly unless in a large system.

Perfect for Peaceful Reef and Community Tanks:

The Half Black Mimic Tang is ideal for aquarists looking for a less aggressive surgeonfish with great utility and colour. It’s well-behaved around corals and invertebrates, making it a strong candidate for reef systems focused on harmony and natural grazing.

Order Your Half Black Mimic Tang Today:

Add the peaceful charm and practical grazing ability of the Half Black Mimic Tang to your marine aquarium. Browse our selection and place your order today to receive a healthy, vibrant fish that will thrive in your aquatic environment.