Orangespine Unicornfish (Naso lituratus) M 45cm

Overview

The Orangespine Unicornfish (Naso lituratus) is one of the most eye-catching surgeonfish available to marine aquarists, prized for its elegant body shape, flowing fins and distinctive orange caudal spines. Also known as the Lipstick Tang or Naso Tang, this species is a true statement fish for large saltwater aquariums and established reef systems. The medium size offered here is a substantial, healthy marine fish suited to experienced keepers with the space and filtration to match.

In the wild, Naso lituratus is an active open-water grazer that spends much of the day cruising reef slopes and outer reef areas. It is a strong swimmer and needs a long, spacious aquarium with excellent water quality, high oxygenation and plenty of room to move. When kept correctly, it becomes a confident, personable fish that adds constant movement and presence to a display tank.

This species is generally considered reef-safe with caution, though individual behaviour can vary. It is best kept with other robust marine fish and peaceful tankmates that will not compete aggressively for food or territory. Because of its adult size and activity level, it is not suitable for small aquariums.

At Tropical Fish Co, we prioritise healthy livestock, careful packing and reliable service. Every order is backed by our live arrival guarantee and fast UK delivery, helping your new fish arrive in the best possible condition.

Care at a Glance

Origin & Natural Habitat

The Orangespine Unicornfish is native to the Indo-Pacific, including reef environments from East Africa and the Maldives through to the central Pacific. It inhabits outer reef slopes, lagoons and surge zones where strong water movement and abundant grazing opportunities are available. These habitats are bright, oxygen-rich and expansive, which explains why the species requires a large aquarium with powerful circulation and plenty of swimming space.

In nature, this fish feeds throughout the day on algae, detritus and small benthic organisms. Its streamlined body and forked tail are built for endurance swimming, making it a constant cruiser rather than a fish that rests in one place. Understanding this natural behaviour is key to successful long-term care in captivity.

Tank Setup & Water Parameters

For best results, house Naso lituratus in a large marine aquarium of at least 900 litres, with more space strongly preferred as the fish matures. A long tank footprint is more important than height, as this species needs uninterrupted swimming lanes. Provide strong, randomised flow, efficient protein skimming and excellent oxygenation to maintain stable conditions.

Rockwork should be arranged to create open channels and sheltered areas without blocking the fish’s route through the tank. Avoid overcrowding the aquascape. Live rock is beneficial for biological filtration and grazing surfaces, but the layout should never reduce swimming space. A secure lid is recommended, as active marine fish can startle and jump.

Stable water quality is essential. Keep salinity consistent and avoid sudden changes in temperature or chemistry. Regular water changes, careful feeding and robust filtration are all important for long-term health. This species is sensitive to poor water quality and should only be added to mature, well-established systems.

Recommended parameters: temperature 24–27°C, pH 8.1–8.4, salinity 1.023–1.026. Ammonia and nitrite must always remain at zero, with nitrate kept as low as practical in a marine environment.

Feeding Guide

The Orangespine Unicornfish is primarily herbivorous, but in captivity it benefits from a varied marine diet. Offer high-quality algae-based foods such as nori, spirulina flakes and marine herbivore pellets as the staple. Supplement with frozen or fresh marine foods including mysis shrimp, copepods and finely chopped seafood to provide variety and support overall condition.

Feed small amounts several times a day rather than one large meal. This mirrors the species’ natural grazing behaviour and helps maintain digestive health. A constant supply of suitable vegetable matter is especially important for preventing weight loss and encouraging natural feeding. If the fish is newly imported, encourage feeding with fresh algae sheets and high-quality pellets before introducing richer foods.

As with all surgeonfish, a balanced diet is vital to keep the fish in peak condition and maintain strong colouration. Avoid overfeeding, and remove uneaten food promptly to protect water quality.

Tank Mates / Compatibility

Naso lituratus is usually peaceful towards non-competitive tankmates but can become assertive with other surgeonfish, especially in confined spaces. It is best kept with similarly robust marine species that will not harass it or outcompete it for food. Suitable companions include larger clownfish, rabbitfish, angelfish, wrasses, gobies, blennies and other non-aggressive reef fish in suitably large systems.

When mixing with tangs or unicornfish, provide a very large aquarium with multiple feeding stations and introduce fish carefully to reduce territorial disputes. Avoid housing with aggressive triggers, large predatory species, or delicate fish that may be intimidated by its size and activity. Small ornamental crustaceans may be at risk in some reef setups, although this species is generally considered reef-compatible with caution.

Compatibility often depends on tank size, aquascape and the temperament of existing fish. In a spacious, mature aquarium, this species can be a superb community marine fish.

Why Buy from Tropical Fish Co

At Tropical Fish Co, we understand that premium marine fish need expert handling from source to doorstep. Our livestock is selected with care, packed professionally and shipped using reliable methods designed to protect fish during transit. We offer fast UK delivery so your new Orangespine Unicornfish reaches you promptly and safely.

We also provide a live arrival guarantee for added peace of mind, because we want you to receive healthy livestock that is ready to acclimate into a suitable marine system. Our team is committed to quality, service and honest advice, helping you choose fish that are appropriate for your aquarium and experience level.

If you are building a large reef display and want a truly impressive centrepiece, the Orangespine Unicornfish is a superb choice. With the right environment, diet and husbandry, it can thrive for many years and become one of the most memorable fish in your collection.