Acanthurus achilles
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The Achilles Tang (Acanthurus achilles) is a strikingly bold surgeonfish whose velvety black body and vivid orange teardrop marking near the tail captivate advanced marine hobbyists. Native to surge‑swept Pacific reefs—especially around Polynesia, Micronesia, and Hawaii—this species is highly active and constantly grazing, requiring excellent flow, oxygenation, and pristine water. Its territorial behavior and sensitivity to stressful conditions make it a challenging but rewarding centerpiece in a large, mature reef system. Achilles tangs are fully reef‑safe but demand precise husbandry; they should only be considered by aquarists experienced with tangs and surge‑zone species.
Achilles Tang thrives in a well‑established tank of at least 180 US gallons (approx. 700 litres), preferably longer rather than tall, to allow for continuous swimming and territory establishment. Strong, chaotic water movement mimicking surge‑zone currents is essential—aim for high GPH turnover and multidirectional flow rather than laminar currents; gyre or propeller pumps are advised to create turbulent environments. Maintain stable, pristine conditions: temperature around 75–78 °F (24–26 °C), specific gravity 1.023–1.025, pH 8.1–8.4, zero ammonia and nitrite, very low nitrates, high dissolved oxygen. Only add this species to a tank that has been fully cycled and stabilized.
Replicate a surge‑zone reef habitat with open swimming lanes and live rock for algal grazing. Avoid slow flow areas; oxygenation must remain high at all times to prevent stress. Many corals and invertebrates cannot tolerate such strong currents—balance coral placement with flow needs.
Achilles tangs are highly territorial and aggressive toward other surgeonfish and similarly shaped tangs. Best kept singly or, in very large systems (>300 gal) as a pre‑bonded pair introduced simultaneously. Compatible tankmates include peaceful, dissimilar fish (e.g., wrasses, anthias, Chromis), and reef-safe invertebrates. They coexist with corals without predation but may damage unsecured frags if startled.
Quarantine new specimens to prevent parasite introduction. Wild‑caught Achilles are especially sensitive; captive‑bred specimens, when available, are preferable. Introduce into the display only once water parameters are fully stable to minimize shock and disease risk.
In the wild, Achilles tangs graze almost continuously on filamentous and fleshy algae in surge‑zone reefs. Their herbivorous digestive physiology relies on a high‑fiber, plant‑based diet.
Replicate grazing behavior by offering multiple daily small meals rich in marine algae: dried nori sheets, spirulina, and algae‑based herbivore pellets. Attach algae sheets to rockwork prominently to entice grazing. Occasional supplementation with nutrient‑rich frozen meaty fare (e.g., mysis shrimp) can help with acclimation, but should remain minimal and not replace plant matter.
Achilles tangs are known to be picky eaters and reluctant to accept prepared foods—persistent offering of algae sheets on the rock is often needed. A weekly fasting day aids digestion and prevents bloating or swim‑bladder issues. Maintain high water quality by feeding sparingly and monitoring uneaten food.