Black Longnose Tang Also known as the Longnose Surgeonfish or Longnose Unicorn Tang (juvenile stage). The Black Longnose Tang is a sleek, uniquely shaped surgeonfish known for its elongated snout, smooth profile, and deep charcoal-to-black body coloration. Found throughout the Indo-Pacific, this species is active, graceful, and constantly grazing. Its distinctive long nose allows it to reach algae tucked between rocks, making it an excellent natural grazer for reef tanks. When properly quarantined, this species adapts well to captivity and becomes a strong, hardy addition to larger marine aquariums. Key Features Scientific Name: Zebrasoma rostratum Common Names: Black Longnose Tang, Longnose Surgeonfish, Longnose Tang Adult Size: 8–10 inches (20–25 cm) Lifespan: 10–15 years with proper care Temperament: Semi-aggressive; territorial toward other tangs Reef Compatibility: Reef-safe, does not nip corals or invertebrates. Minimum Tank Size: 180 gallons (larger recommended) Experience Level: Intermediate to Advanced, requires pristine water and ample swimming space. Habitat & Tank Requirements Natural Habitat: Native to French Polynesia and surrounding Pacific regions, this tang inhabits clear outer reefs, grazing along vertical rock faces and coral slopes. Tank Environment: Large open swimming areas Plenty of live rock for grazing Moderate to strong water flow High oxygen levels Stable, mature aquarium required Water Parameters Temperature: 74–80°F (23–27°C) Salinity: 1.023–1.025 pH: 8.1–8.4 Ammonia/Nitrite: 0 ppm Nitrate: <15 ppm Alkalinity: 8–12 dKH Essential Equipment Oversized protein skimmer Strong circulation pumps UV sterilizer for disease reduction Reliable auto top-off system High-capacity biological filtration Regular water changes (10–15% weekly) Diet & Feeding Black Longnose Tangs are herbivores that require constant plant-based nutrition. Recommended Foods Nori sheets (green, red, or brown) Spirulina-based pellets and flakes Frozen herbivore blends Marine algae sheets Occasional mysis or brine (supplements only) Vitamin- or garlic-soaked foods to boost immunity Feeding Schedule Feed 2–3 times daily Keep nori available on a clip Provide algae-rich diet for long-term health and color Behavior & Compatibility Temperament: Active, alert, and assertive, especially toward other tangs. Peaceful with most non-tang species. Tank Mates: Compatible with: Wrasses Gobies Anthias Butterflyfish Peaceful reef fish Caution with: Other Zebrasoma tangs Surgeonfish with similar shape or diet Avoid: Aggressive triggers Groupers Very small timid fish if aggression becomes territorial Color & Development Coloration Characteristics: Deep black or charcoal body Elongated snout Smooth dorsal and anal fin lines Sharp white caudal spine Soft gradient toward lighter fin edges in some individuals Color Intensity: A high-quality herbivore diet ensures rich, stable coloration. Poor water quality or stress may cause dulling. Size & Growth: Juveniles start at 2–3 inches and grow steadily, reaching adult size within 2–3 years. Acclimation & Care Tips Initial Acclimation: Drip acclimate for 45–60 minutes Float bag for 15–20 minutes Dim lights during introduction Provide rockwork hiding spots Offer nori immediately Health Considerations: Black Longnose Tangs may be prone to: Marine ich Marine velvet HLLE (Head and Lateral Line Erosion) from poor diet or water quality Bacterial infections if stressed Quarantined specimens have significantly improved survival and feeding response. Signs of a Healthy Specimen: Smooth, consistent dark coloration Clear, bright eyes Strong grazing behavior Active swimming No spots, lesions, or fin tears Steady appetite Special Considerations Quarantine is Recommended: This species is sensitive to parasites and stress during transport. Dr Reef’s quarantine ensures they are: Observed for several weeks Preventatively treated when necessary Stabilized and feeding well Adapted to captive conditions Breeding Potential Breeding Black Longnose Tangs in home aquariums is extremely rare. They require very large open-water conditions and group-spawning behavior that cannot be reproduced in typical tanks. While they display natural social behaviors, actual spawning is not expected in captivity. Why Choose a Quarantined Black Longnose Tang? A fully quarantined specimen offers better long-term success, fewer health issues, stronger feeding habits, and a smoother transition into your display tank, giving you confidence that your new tang will thrive in your reef system.
