Unicorn Tang

Also known as the Bluespine Unicorn Tang or Naso unicornis.
The Unicorn Tang is a large, majestic tang recognized for its elongated body, prominent horn-like forehead (in adults), and graceful swimming. Native to Indo-Pacific reefs, this species is highly active, peaceful, and a prolific grazer, helping maintain algae levels in large reef aquariums. Its elegant movement and striking appearance make it a showpiece fish suitable for advanced aquarists with spacious tanks.

Key Features

• Scientific Name: Naso unicornis
• Common Names: Unicorn Tang, Bluespine Unicorn Tang, Naso Tang
• Adult Size: 15–20 inches (38–50 cm)
• Lifespan: 10–15+ years with excellent care
• Temperament: Peaceful; may establish territory with other tangs
• Reef Compatibility: Reef-safe 
• Minimum Tank Size: 360 gallons 
• Experience Level: Advanced 

Habitat & Tank Requirements

Natural Habitat:
Found on coral-rich outer reef slopes and lagoons of the Indo-Pacific, including Hawaii, Fiji, and the Great Barrier Reef. They thrive in areas with moderate to strong currents and abundant algae for grazing.

Tank Environment:

• Large, open swimming areas
• Plenty of live rock for grazing and shelter
• Stable water parameters with high oxygen levels
• UV sterilizer recommended to reduce parasite exposure

Water Parameters:

• Temperature: 75–82°F (24–28°C)
• Salinity: 1.023–1.026
• pH: 8.1–8.4
• Ammonia/Nitrite: 0 ppm
• Nitrate: <10 ppm
• Alkalinity: 8–12 dKH

Essential Equipment:

• Oversized protein skimmer
• Strong circulation pumps
• UV sterilizer for parasite prevention
• Auto-top-off system for stability
• Regular water changes (15–20% weekly)

Diet & Feeding

Unicorn Tangs are primarily herbivorous, grazing continuously on algae. A varied diet is necessary to maintain their health, coloration, and growth.

Recommended Foods:

• Nori sheets (green, red, brown)
• Spirulina-based flakes or pellets
• Frozen herbivore blends
• Occasional mysis or brine shrimp for variety
• Vitamin-enriched foods for immune support

Feeding Schedule:

• Feed 2–3 times daily
• Provide constant access to algae or nori
• Rotate food types to ensure balanced nutrition

Behavior & Compatibility

Unicorn Tangs are generally peaceful but may establish mild territory with other tangs, especially in smaller tanks. They are active swimmers and integrate well into large community reef aquariums.

Tank Mates:

• Compatible with: peaceful community fish, wrasses, gobies, blennies, anthias, and most reef-safe species
• Caution with: other tangs in confined spaces
• Avoid: overcrowding of surgeonfish

Color & Development
Unicorn Tangs display a bluish-gray body with subtle lateral lines, bright orange or yellow caudal fin edges, and a horn-like protuberance in adults. Juveniles lack the horn and have slightly different markings that smooth as they mature.

Size & Growth:
Juveniles are typically 4–6 inches and grow steadily to 15–20 inches as adults.

Acclimation & Care Tips

Initial Acclimation:

• Drip acclimate for 45–60 minutes
• Float bag for temperature equalization
• Dim lights during introduction
• Provide immediate access to algae and hiding areas
• Avoid adding to new or unstable tanks

Health Considerations:
Unicorn Tangs can be prone to marine ich (Cryptocaryon), marine velvet (Amyloodinium), and HLLE if diet or water quality is poor.

Signs of a Healthy Specimen:

• Active grazing and swimming
• Clear eyes and smooth fins
• Strong appetite and vibrant coloration
• No flashing or labored breathing

Special Considerations

Quarantine is Recommended:
Quarantined Unicorn Tangs have higher survival rates, are conditioned to prepared foods, and are free from parasites. Dr Reef’s quarantine protocol ensures each fish is:

• Observed and treated preventatively
• Conditioned to aquarium diet
• Stabilized before shipment

Breeding Potential

Breeding Unicorn Tangs in captivity is extremely rare due to their size, schooling, and spawning behaviors. Most spawning events occur only in large, stable reef systems.

Why Choose a Quarantined Unicorn Tang?

Quarantined Unicorn Tangs settle faster, eat readily, and adapt to aquarium life more efficiently. Their health, coloration, and natural grazing behavior are ensured, making them a showpiece for large, advanced reef aquariums.