Description
Acanthurus achilles, commonly known as the Achilles Tang, is widely regarded as one of the most iconic and prestigious surgeonfish in the marine aquarium world. Revered for its velvety black body contrasted by a vivid orange teardrop near the caudal peduncle and electric blue edging along the dorsal and anal fins, the Achilles Tang combines aggression, elegance, and athletic movement into a single unmistakable presence.
Native to the high-energy reef zones of the Pacific, particularly Hawaii and surrounding regions, this species is adapted to surge environments with intense oxygenation and constant water movement. Its relentless swimming behavior and dramatic coloration give it a commanding visual impact that few tangs can rival in mature marine systems.
What separates premium Achilles specimens is not simply coloration, but condition. Thick-bodied individuals with uninterrupted finnage, deep black saturation, crisp orange contrast, and aggressive feeding response are considered top-tier collector specimens. Proper acclimation and long-term stability are critical, as the species has historically carried a reputation for sensitivity and high care demands.
Among experienced reef keepers, the Achilles Tang has become a benchmark fish—one that signals both commitment and capability within a serious marine collection.
Collector’s Note:
High-grade Achilles Tangs remain among the most sought-after surgeonfish in the hobby due to their unmatched contrast, constant motion, and demanding care profile. Large, fully acclimated specimens in flawless condition are considered centerpiece acquisitions within elite reef systems.
Lighting: Moderate to high; strong reef lighting enhances contrast and blue fin edging
Flow: Very high; requires intense water movement and exceptional oxygenation
Placement: Active swimmer occupying mid to upper water column with extensive open swimming space
Temperature: 75–80°F (24–27°C)
Salinity: 1.0265 SG (35 PPT)
pH: 8.1–8.4
Alkalinity: 8–10 dKH
Diet: Herbivorous; requires frequent feeding of marine algae, nori, herbivore preparations, and supplemental frozen foods
Aggression: Aggressive; highly territorial toward other tangs and similarly shaped fish
Adult Size: Up to 25 cm
Care Level: Advanced – requires pristine water quality, high oxygenation, strong flow, and substantial swimming space
Compatibility: Reef-safe; best housed with carefully selected tank mates in large, stable marine systems
