The Acanthurus achilles, commonly known as the Achilles Tang, is a visually stunning species prized for its deep black body accented with bright orange and white markings. This small variant is perfect for marine aquarium enthusiasts seeking a bold and active fish.
Care Level: Moderate to advanced. Achilles Tangs require stable water conditions and a mature aquarium environment.
Temperament and Compatibility: Generally semi-aggressive. Best housed with other robust fish species but avoid keeping multiple tangs of the same genus unless the tank is very large. Suitable tank mates include other tangs, wrasses, and larger peaceful fish. Avoid slow-moving or very timid species.
Diet: Primarily herbivorous. Provide a varied diet rich in marine algae and seaweed, supplemented with high-quality herbivore pellets and occasional meaty foods to ensure balanced nutrition.
Minimum Tank Size: A minimum of 180 litres (approximately 50 gallons) is recommended to provide sufficient swimming space and reduce territorial behaviour.
Lighting and Water Flow: Standard reef aquarium lighting is suitable. Moderate to strong water flow mimics their natural reef habitat and supports their health.
Placement: Provide plenty of live rock for grazing and hiding spots. Open swimming areas are essential for this active species.
Origin: Native to the central Pacific Ocean, including Hawaii and surrounding islands.
Maximum Size: Typically grows up to 23 cm (9 inches) in length.



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