Powder Blue Tang

Powder Blue Tang The Powder Blue Tang (Acanthurus leucosternon) is one of the most visually iconic surgeonfish in the hobby—brilliant blue body, jet‑black face mask, and a vivid yellow dorsal fin—but also one of the most demanding and disease‑prone.** Below is a clean, shop‑ready overview built from current authoritative sources. Citations appear throughout. 🐠 Species Identity Scientific name: Acanthurus leucosternon Common names: Powder Blue Tang, Powder Blue Surgeonfish Adult size: ~9 in (23–24 cm) Distribution: Exclusively Indian Ocean—Maldives, Sri Lanka, East Africa, Seychelles, Mauritius Appearance: Powder‑blue body, black facial mask, bright yellow dorsal fin, white chest/anal fin, white tail with yellow bar 🌊 Natural Habitat Shallow surge‑swept reef flats, lagoons, and reef slopes with strong currents Depth range: 2–25 m (6–82 ft) Wild behavior: Constant algae grazer; often found in large schools of hundreds 🧭 Behavior & Temperament Semi‑aggressive to aggressive, especially toward other tangs or similarly shaped species Highly territorial; best kept singly unless the system is extremely large Should be added last to community tanks to reduce dominance behavior Very active swimmer; becomes stressed quickly in confined spaces 🐟 Aquarium Requirements Minimum tank size: 110–132 gallons (400–500 L) recommended minimum Practical reefkeeping minimum: 125 gallons with 6‑ft length for swimming lanes Aquascape: Long horizontal swim space Mature live rock with natural algae for grazing Open lanes + structured rockwork (arches/islands) Flow: Moderate to strong, high oxygenation—mimics surge‑zone habitat Water quality: Extremely sensitive to ammonia, nitrite, nitrate accumulation, and parameter swings Requires pristine, stable conditions; oversized skimmer recommended 🍃 Diet Herbivore specializing in filamentous algae In captivity: Nori sheets Spirulina‑based flakes/pellets Algae‑rich frozen foods Occasional mysis/brine as supplements (not staples) Multiple small feedings daily mimic natural grazing and reduce stress 🩺 Hardiness & Disease Care level: Difficult—not beginner‑friendly Highly prone to: Marine ich (Cryptocaryon) Marine velvet (Amyloodinium) Stress‑related immune suppression Strict quarantine and careful acclimation are essential Does best in mature, stable reef systems with abundant natural grazing surfaces 🤝 Compatibility Good tankmates: Larger wrasses, anthias, rabbitfish, reef‑safe angelfish, peaceful but robust reef fish (different ecological niches) Avoid: Other Acanthurus tangs (unless in very large systems) Aggressive or territorial species Fast feeders that increase stress 🧬 Captive Breeding Not captive‑bred; breeding in captivity remains experimental and uncommon 🧾 Quick Reference (for shop signage) Scientific name: Acanthurus leucosternon Size: 8–9" Temperament: Semi‑aggressive Diet: Herbivore Reef‑safe: Yes Minimum tank: 125+ gallons Care level: Difficult Notes: Highly sensitive to stress; quarantine mandatory