The Naso tang, or orangespine unicornfish, is a large, elegant surgeonfish with a gray body, yellow-edged fins, orange lips, and bright orange tail-spine plates. It is one of the more peaceful and disease-resistant tangs, but its eventual size and need for huge swimming space make a large tank essential. Mature males develop trailing filaments on the tail.
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Tangs and surgeonfish are active, algae-grazing reef fish prized for bold color and constant motion. Most need large tanks with open swimming room, good flow, and a steady supply of marine algae to graze.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
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Minimum
Long open-water reef
180 gal / 680 L long reef (≥6 ft)
Naso lituratus reaches 45 cm and swims constantly along reef faces — LENGTH matters far more than volume. 6-ft tank is the entry minimum; shorter tanks cause swim damage and starvation.
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Recommended
Large open reef
240–300 gal / 900–1100 L
8-ft+ reef with strong cross-flow, oversized skimmer, and a constant nori supply. Naso tangs are herbivores — vegetable matter must be available all day.
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Ideal
Public-aquarium-scale display
500 gal+ / 1900 L+ display
Very long display (≥10 ft) with current-driven swim lanes, abundant grazing surfaces, and species-appropriate tankmates. Closest to natural cruising range.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
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Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
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Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
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Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Provide a very large system of at least 680 L (180 gal) with a length of 1.8 m (6 ft) or more of open swimming space, as this is a powerful, fast-cruising fish. Maintain temperature 24-27 C (75-81 F), pH 8.1-8.4, salinity SG 1.020-1.026, alkalinity 8-12 dKH, and low nitrate. Strong, oxygen-rich flow and good reef lighting suit it well.
Substrate
Aragonite sand with live rock provides grazing surfaces, but the priority is a long, open swimming lane; keep aquascaping toward the back and sides.
Equipment & setup
Use robust biological filtration, an oversized protein skimmer, and strong circulation pumps for high oxygenation. A dependable heater and reef lighting complete the system.
Diet
Herbivorous with a particular fondness for brown macroalgae; offer dried marine algae (nori) and brown/red algae sheets daily plus herbivore preparations, supplemented with some meaty foods like mysis. Plentiful algae keeps this large grazer healthy and well-colored.
Behavior & temperament
Reef-safe and one of the more peaceful large tangs, generally ignoring corals and tolerant of dissimilar tankmates. Still territorial toward other Naso and tangs, so keep one per tank unless the system is enormous. The fixed orange tail-spine plates can cut, so handle with care.
Health
More resistant to ich than many tangs but still vulnerable to Cryptocaryon and velvet under stress. HLLE can occur with poor diet or chronic stress. Quarantine new arrivals and keep water pristine and stable.
Tips, DIY & hacks
Drip-acclimate and quarantine for a few weeks; Naso tangs ship reasonably well but need quick access to food. Offer brown macroalgae specifically, which they relish, and plan for their large adult size from the start.
