Saltwater Fish
Acanthurus coeruleus

Species Description…

Scientific Name: Acanthurus Coeruleus
Common Name: Atlantic Blue Tang
Species Group: Surgeonfish
Habitat: Reef Safe
Care Level: Intermediate
Temperament: Semi-aggressive
Diet Type: Herbivore
Role in Aquarium: Showpiece Fish
Max Fish Length: 15 (inches)
Min Aquarium Size: 180 (gallons)
Native Range: Western Atlantic Ocean, from New York to Brazil, including the Caribbean and Gulf of Mexico
Acanthurus Coeruleus - Atlantic Blue Tang

Acanthurus Coeruleus (Atlantic Blue Tang)

Overview

  • Native to the Atlantic Ocean, including the Caribbean and the Gulf of Mexico.
  • Recognized for its vibrant blue coloration and oval-shaped body with a sharp caudal spine.
  • A highly active species known for its constant grazing behavior.
  • Popular in marine aquariums due to its striking appearance and algae-eating habits.

Feeding

  • Herbivorous diet, primarily grazing on marine algae.
  • Requires a diet rich in plant-based foods, including seaweed, spirulina, and herbivore pellets.
  • Supplementing with fresh vegetables like zucchini or dried seaweed supports optimal health.
  • Frequent small feedings encourage natural grazing behavior and maintain energy levels.

Habitat

  • Commonly found in coral reefs and rocky coastal areas with moderate to strong water flow.
  • Prefers stable water conditions with high oxygen levels.
  • Requires an aquarium with live rock for grazing and open swimming space.
  • Thrives in environments that mimic its natural surroundings with strong water movement.

Fish Care

  • Optimal water temperature: 74-82°F (23-28°C).
  • Ideal pH level: 8.1-8.4, with a specific gravity of 1.020-1.025.
  • Prone to stress-related illnesses such as marine ich; requires pristine water conditions.
  • Best introduced into a mature aquarium with excellent filtration and strong water flow.
  • Providing ample swimming space and hiding areas reduces stress and supports long-term health.

Compatibility

  • Can be semi-aggressive, especially towards other tangs.
  • Compatible with peaceful tank mates such as wrasses, clownfish, and angelfish.
  • Should not be housed with overly aggressive species that may cause stress.
  • Does well in a community reef setup with proper space and hiding spots.

Aquarium Behavior

  • Active swimmer, constantly patrolling the aquarium and grazing on algae.
  • Can display territorial tendencies, particularly in smaller environments.
  • Often interacts with other tank mates but may establish dominance over time.
  • Providing an environment with live rock and algae helps encourage natural behaviors.