Black Shoulder Tang Acanthurus nigricaudus

Black Shoulder Tang Reef Behavior and Aquarium Care

The Black Shoulder Tang displays a subtle gray-to-brown body with a distinct dark marking near the eye. This feature gives the species its recognizable “black shoulder” appearance. It adds steady movement and natural grazing behavior to larger reef aquariums.

This species performs best in mature systems with stable parameters and strong water flow. Plenty of open swimming space helps maintain long-term health and reduce stress.

Black Shoulder Tang Tank Setup and Swimming Needs

A minimum tank size of 250 gallons is recommended due to its adult size and active nature. This fish requires long stretches of open water along with rockwork for grazing and shelter.

The Black Shoulder Tang remains active throughout the day. It frequently moves between rock surfaces and open areas while searching for algae. Introduce with caution when housing other tangs, as it may become territorial in tighter environments.

Black Shoulder Tang Diet and Feeding Routine

This species thrives on a varied omnivorous diet with a strong emphasis on plant-based nutrition. Frequent feeding supports immune health and helps reduce aggressive tendencies.

Offer:

• Dried seaweed or nori on a clip
• Spirulina-based pellets or flakes
• Frozen mysis shrimp or brine shrimp

Feed algae-based foods multiple times per week to support natural grazing behavior.

Growth and Appearance

This species can reach up to 16 inches in length under proper conditions. As it matures, its coloration becomes more defined, with the dark shoulder marking standing out more clearly against the body.

Juveniles may appear lighter and less contrasted. Over time, the body deepens in tone and the signature marking becomes more pronounced.

Temperament and Compatibility

The Black Shoulder Tang is generally peaceful toward most tankmates. However, it may show aggression toward similar species, especially other tangs.

For best results, house it with non-competitive species and provide adequate space to reduce territorial behavior.

Care Facts

• Care Level: Moderate
• Temperament: Peaceful
• Diet: Omnivore
• Reef Safe: Yes
• Minimum Tank Size: 250 gallons
• Max Size: 16 inches
• Scientific Name: Acanthurus nigricaudus