Clown Tang

The Clown Tang (Acanthurus lineatus) is one of the most spectacular—and one of the most demanding—surgeonfish in the hobby, known for its electric blue and yellow striping, extreme aggression, and very high activity level.** It is widely regarded as an advanced‑keeper species requiring large, high‑flow systems. 🐠 Species Identity Scientific name: Acanthurus lineatus Common names: Clown Tang, Lined Surgeonfish, Blue‑lined Tang Adult size: 10–14 inches in captivity; up to 15 inches in the wild Lifespan: 10–20 years with excellent care Origin: Indo‑Pacific—East Africa to Hawaii, Japan to the Great Barrier Reef 🎨 Appearance Bold horizontal electric‑blue stripes outlined in black across a yellow‑orange body Pale ventral surface; deep blue crescent tail Juveniles show even more saturated coloration Streamlined, torpedo‑shaped body built for speed 🌊 Natural Habitat Shallow surge‑swept reef crests and exposed outer reef slopes Extremely high‑energy environments with constant wave action Territorial grazers patrolling large areas of algae‑covered rock 🧭 Behavior & Temperament One of the most aggressive tang species—hyper‑territorial and intolerant of similar fish Aggression increases with size; will often harass other tangs relentlessly Should be the last fish added and typically the only tang in the system Highly active, constantly grazing and swimming long distances 🏡 Aquarium Requirements Minimum tank size: 180–200+ gallons recommended; 6–8 ft length minimum for sustained swimming Flow: Strong, turbulent, high‑oxygen—mimics surge zones Aquascape: Long open swim lanes Heavy rockwork for grazing Water quality: Extremely stable, pristine conditions Sensitive to stress and parameter swings 🍃 Diet Obligate herbivore—constant grazer of filamentous algae In captivity: Nori sheets (daily) Spirulina‑enriched pellets Herbivore frozen blends Needs multiple feedings per day to meet high metabolic demand Vitamin‑enriched foods help prevent HLLE 🩺 Hardiness & Health Difficulty: Advanced—prone to stress, disease, and feeding issues when newly imported Often arrives wild‑caught and may resist prepared foods initially High metabolic rate → requires constant grazing and stable water chemistry Quarantine strongly recommended 🤝 Compatibility Good tankmates: Large, robust, dissimilar species (large wrasses, triggers, groupers) in very large systems Avoid: Other tangs (especially Acanthurus species) Passive or timid fish Small tanks or crowded communities Reef‑safe: Yes—does not harm corals; excellent algae grazer