About Achilles Tang
The Achilles tang is gorgeous and notoriously difficult — wild-caught only, prone to ich, and demands large swimming room with strong flow that mimics the surge zones it comes from. An expert fish, often listed at expert prices.
Acanthurus achilles, the Achilles tang, redtail surgeonfish or redspot surgeonfish, is a marine ray-finned fish belonging to the family Acanthuridae, the surgeonfishes, unicornfishes and tangs. This fish is found in the Pacific Ocean.
Notes from the editors
What it looks like. Deep black body with a vivid orange teardrop near the tail and orange highlights on the fins. One of the most striking surgeonfish in the hobby — and notoriously expensive ($300–800+).
In your tank. Difficult specialist. Comes from the surge zones of the Hawaiian and central Pacific reefs, where they constantly swim in strong, oxygenated current. In captivity they need 180+ gallons, surge-style flow, and exceptionally stable water quality. Prone to ich and HLLE; quarantine is non-negotiable.
Care notes. Will not thrive in a typical reef tank with moderate flow. Build the system around the fish or skip the species. Aggressive toward other tangs of similar shape; usually housed singly. Will graze film algae but needs supplemental nori or prepared herbivore foods.
Sourcing and feeding. Wild-collected only; aquaculture has not been commercialized. Hawaii-sourced specimens have largely disappeared from the market following the 2017 ban; current supply comes from other Pacific locations with variable shipping mortality. Confirm the specimen is eating before purchase.
Care info is a starting point, not a guarantee. Individual specimens, water chemistry, and tankmate dynamics vary. Verify against multiple sources and adjust to what you observe. See our terms & disclaimers.
Related fish
Sources & attribution
- Taxonomy and accepted name from the World Register of Marine Species (WoRMS AphiaID 272957).
- Description content adapted from Wikipedia, available under CC BY-SA 4.0.
- Photo: Jean · CC BY 2.0 (via iNaturalist or Wikimedia Commons).

