Naso Tang…

The Naso lituratus, commonly known as the Naso tang or Orangespine unicornfish, is a large and distinctive marine fish species belonging to the family Acanthuridae. It’s renowned for its unicorn-like horn and vibrant coloration. Naso tangs are captivating additions to larger marine aquariums due to their unique appearance and behavior. Their care requirements, along with the necessary space and proper diet, should be thoroughly understood before bringing one into a home aquarium. Here are some key details about the Naso tang:

Behavior and Habitat…

  • Naso tangs are found in the warm tropical waters of the Indo-Pacific region, including the Red Sea and the Great Barrier Reef.
  • They inhabit coral reefs and lagoons, often swimming in small groups or pairs.
  • These fish are known for their peaceful nature, but they can become territorial if kept in smaller aquariums.


  • The Naso tang has a laterally compressed, oval-shaped body with a pointed snout that resembles a unicorn’s horn.
  • It features a dark blue to purple body coloration with a bright yellow stripe running along its dorsal fin.
  • Adult males typically have a more elongated horn than females.


Aquarium Care…

  • Naso tangs require spacious aquariums with plenty of swimming space and hiding spots.
  • A tank size of at least 150 gallons is recommended for a single adult Naso tang.
  • Proper water quality, stable temperature, and efficient filtration are crucial.
  • Avoid housing multiple Naso tangs together unless you have a very large tank to reduce territorial behavior.


  • Naso tangs are herbivores, primarily grazing on algae and other plant matter.
  • In an aquarium, their diet should include a mix of high-quality herbivore pellets, dried seaweed, and fresh vegetables.

Life Span…

  • In their natural habitat, Naso tangs have an average lifespan of around 10 to 15 years.
  • With proper care in a well-maintained aquarium, their lifespan can be extended.


  • Naso tangs are relatively large fish, and their size can vary based on gender and maturity.
  • They can grow to a size of around 16 to 20 inches (40 to 50 cm) in length, with males often being larger than females.

Conservation Status…

  • Naso tangs are not currently classified as endangered or threatened.
  • However, their populations can be affected by habitat destruction, overcollection for the aquarium trade, and other environmental factors.


  • While generally peaceful, Naso tangs may exhibit aggression towards other tangs, especially those of similar body shapes and colors.
  • Careful consideration of tank mates is important to prevent aggression and stress.