Blue Unicorn Tang

Blue Unicorn Tang
Latin name:
(Naso brevirostris)

Care Level





Black, Blue, White



Preferred Conditions

sg 1.020-1.025, 72-78° F, dKH 8-12, pH 8.1-8.4

Avg. Max Size


Minimum Tank Size

360 gallons


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Blue Unicorn Tang: A Guide for Marine Aquarium Enthusiasts

The Blue Unicorn Tang, also known as the Powder Blue Surgeonfish, is a captivating marine fish that has captured the hearts of aquarium hobbyists worldwide. With its vibrant blue coloration and striking horn-like dorsal fin, this fish adds a touch of elegance and wonder to any saltwater aquarium. In this comprehensive guide, we will delve into the fascinating world of the Blue Unicorn Tang, exploring its unique characteristics, care requirements, and captivating behaviors.

Blue Unicorn Tang: An Overview

The Blue Unicorn Tang belongs to the Acanthuridae family, which includes surgeonfish and tangs. It is native to the tropical waters of the Indo-Pacific region, ranging from the Red Sea to the Hawaiian Islands. This fish is characterized by its vibrant blue coloration, which can vary in intensity depending on its mood and environment. The Blue Unicorn Tang also possesses a distinctive horn-like dorsal fin, which it uses for defense and display.

Care Requirements for the Blue Unicorn Tang

Providing a suitable environment for the Blue Unicorn Tang is crucial for its well-being and longevity. Here are some essential care requirements to consider:

Tank Size:

The Blue Unicorn Tang requires a spacious aquarium to thrive. A tank size of at least 125 gallons is recommended, providing ample swimming space and room for the fish to establish its territory.

Water Parameters:

The Blue Unicorn Tang prefers warm, well-oxygenated water with stable parameters. Maintain a water temperature between 72-78°F (22-26°C), a pH of 8.1-8.4, and a specific gravity of 1.025-1.026. Regular water changes are essential to maintain water quality and prevent the buildup of harmful substances.


The Blue Unicorn Tang is an omnivore with a varied diet. Offer a combination of high-quality marine algae, such as nori and spirulina, along with live and frozen foods like brine shrimp, mysis shrimp, and chopped seafood. Provide a varied diet to ensure the fish receives a balanced nutritional intake.

Tank Mates:

The Blue Unicorn Tang can be a territorial and aggressive fish, especially towards other tangs and surgeonfish. Choose tank mates carefully, opting for peaceful and compatible species. Avoid housing the Blue Unicorn Tang with aggressive or boisterous fish that may stress or harass it.

Behavior and Compatibility

The Blue Unicorn Tang is known for its active and playful behavior. It is a diurnal fish, meaning it is most active during the day. This fish enjoys swimming in open water and exploring its surroundings. The Blue Unicorn Tang can be territorial towards other tangs and surgeonfish, but it can coexist peacefully with other non-aggressive species.

Breeding the Blue Unicorn Tang

Breeding the Blue Unicorn Tang in captivity is a challenging task that requires specialized knowledge and facilities. The fish has not been successfully bred in captivity on a commercial scale. However, there have been isolated reports of successful breeding in public aquariums.

Common Diseases and Health Issues

Like all fish, the Blue Unicorn Tang is susceptible to various diseases and health issues. Some common ailments include:


Ich is a parasitic infection caused by a protozoan. It manifests as white spots on the fish’s body and fins. Treatment involves using copper-based medications or raising the water temperature to kill the parasite.

Marine Ich:

Marine Ich is a similar infection caused by a different protozoan. Symptoms include white spots on the fish’s body and fins, as well as lethargy and loss of appetite. Treatment involves using copper-based medications or raising the water temperature.


Velvet is a parasitic infection caused by a dinoflagellate. It appears as a golden or rusty-brown coating on the fish’s body and fins. Treatment involves using copper-based medications or raising the water temperature.

FAQs About the Blue Unicorn Tang

Q: Is the Blue Unicorn Tang a good choice for beginner aquarists?
A: No, the Blue Unicorn Tang is not suitable for beginner aquarists. It requires a large tank, specialized care, and a varied diet. This fish is best suited for experienced aquarists who can provide the necessary care and attention.
Q: Can the Blue Unicorn Tang be kept in a reef tank?
A: Yes, the Blue Unicorn Tang can be kept in a reef tank, provided that the tank is large enough and the fish is introduced carefully. The Blue Unicorn Tang may nip at corals and other invertebrates, so it is important to monitor its behavior closely.
Q: How long do Blue Unicorn Tangs live?
A: The Blue Unicorn Tang has a lifespan of around 10-15 years in captivity. With proper care and maintenance, some individuals may live even longer.


The Blue Unicorn Tang is a captivating and alluring fish that can add a touch of magic to any saltwater aquarium. However, its specialized care requirements and potential for aggression make it a suitable choice only for experienced aquarists. With patience, dedication, and the right setup, the Blue Unicorn Tang can thrive and bring years of enjoyment to its owner.