Desjardini Sailfin Tang

The Desjardini Sailfin Tang (Zebrasoma desjardinii) is a large, striking Indian Ocean/Red Sea surgeonfish known for its tall sail-like fins, bold striping, and constant grazing behavior.** It’s hardy once established but absolutely a big‑tank species requiring space, oxygen-rich water, and steady algae availability. 🐠 Identity & Appearance Common names: Desjardini Sailfin Tang, Red Sea Sailfin Tang, Indian Sailfin Tang Scientific name: Zebrasoma desjardinii (Bennett, 1836) Coloration & pattern: Grey body with 8 dark vertical bars, each containing yellow/orange lines that break into spots toward the belly. Dense yellow spotting on head and body. Tail often yellow with pale blue spotting. Fins: Extremely tall dorsal and anal fins—when fully extended, the fish appears nearly as tall as it is long. Size: Up to 40 cm (16 in) in the wild; commonly 9.5–14 in in aquaria. 🌍 Natural Habitat Range: Indian Ocean and Red Sea—East Africa, Saudi Arabia, Yemen, Israel, Andaman Sea. Environment: Coral-rich reef slopes, lagoons, and seaward reef faces. Behavior in the wild: Juveniles hide among branching corals. Adults patrol open reef zones, grazing continuously. 🧠 Temperament & Behavior Temperament: Semi-aggressive; becomes more territorial with age. Activity: Constant grazer and active swimmer; needs long horizontal runs. Reef-safe: Generally yes—may nip fleshy polyps if underfed. 🏡 Aquarium Care Minimum tank size: 180 gallons (absolute minimum) 240+ gallons strongly recommended for adults. Aquascape: Open swimming lanes. Sturdy rockwork with algae growth for grazing. Water parameters: Temp: 75–79°F (24–27°C) Salinity: 1.023–1.026 pH: 8.1–8.4 Nitrate: <20 ppm Flow: Moderate to strong; high oxygenation essential. Lighting: Strong lighting helps natural algae growth. 🍽️ Diet Primary diet: Strict herbivore—marine algae, nori, spirulina. Feeding frequency: Multiple small feedings daily (3–5× ideal). Supplemental foods: Herbivore pellets, spirulina-enriched frozen foods; occasional mysis/brine. Critical note: Needs constant algae availability—lack of vegetable matter leads to immune weakness and HLLE. 🧬 Lifespan & Health Lifespan: 8–15 years depending on conditions. Common issues: Marine ich, velvet, flukes. HLLE from poor diet or unstable water. Prevention: 4–6 week quarantine recommended. Stable salinity and high oxygen. Vitamin-rich herbivore diet. 🪸 Compatibility Good with: Wrasses, gobies, anthias, clownfish, peaceful reef fish. Avoid: Other Zebrasoma tangs unless tank is extremely large (>1500 L). Very aggressive tangs or surgeonfish. Best practice: Introduce last; provide multiple feeding stations. 📌 Quick Summary (Seahorse Aquarium–friendly) Size: Up to 15" Tank: 180–240+ gallons Diet: Strict herbivore; constant grazing Temperament: Semi-aggressive Reef-safe: Yes (with adequate feeding) Origin: Indian Ocean & Red Sea Care level: Moderate Key needs: Space, oxygen, algae, stable water