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FishintermediateSaltwater

Atlantic Blue Tang

Acanthurus coeruleus

AnimaliaChordataActinopterygiiAcanthuriformesAcanthuridae

📍 Atlantic Ocean, Caribbean to Brazil

Ask Finn

Caribbean relative of the Blue Tang with a deeper blue-purple body and yellow pectoral fin edge. Adults are solid blue-grey; juveniles are bright yellow. A beautiful and hardy Atlantic tang.

Size9"
Min Tank75g
semi-aggressive
Zonemid

Care Guide

Diet

Atlantic Blue Tangs are primarily herbivorous and require a diet rich in algae and vegetable matter. Feed high-quality marine algae flakes, nori sheets, and spirulina-based pellets daily, supplemented 2-3 times weekly with frozen foods like mysis shrimp or brine shrimp. A well-established tank with natural algae growth is essential; without adequate algae, they may nip at corals and become nutritionally deficient.

Behavior

This species is semi-aggressive and territorial, especially as it matures from bright yellow juvenile to solid blue-grey adult. They are active mid-water swimmers that spend much of their day grazing on algae and exploring the tank. Males can be particularly aggressive toward other tangs and similar-shaped fish, though they generally tolerate peaceful community members.

Breeding

Breeding Atlantic Blue Tangs in captivity is extremely rare and considered impractical for home aquarists. They are open-water spawners that require massive tank volumes and specific environmental triggers unlikely to occur in captivity. No documented successful breeding in home aquariums exists.

Common Diseases

Marine Ich (White Spot Disease)

Symptoms

White spots on body and fins, rapid breathing, flashing against rocks, lethargy

Treatment

Increase water temperature to 26-27°C, maintain excellent water quality, consider copper-based treatments or hyposalinity therapy; quarantine infected fish

Fin Rot

Symptoms

Frayed or deteriorating fin edges, discoloration at fin margins, progressive fin loss

Treatment

Improve water quality and reduce stress; perform frequent water changes; use antibiotic treatments if bacterial infection confirmed

Head and Lateral Line Erosion (HLLE)

Symptoms

Pitting or erosion of head and lateral line, loss of flesh around sensory organs

Treatment

Improve diet with vitamin-enriched foods, especially vitamin C and quality algae; ensure excellent water quality and reduce stressors

Parasitic Infections

Symptoms

Excessive scratching, visible parasites, cloudy eyes, behavioral changes, loss of appetite

Treatment

Quarantine affected fish; use appropriate antiparasitic treatments; maintain optimal water parameters and tank cleanliness

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Quick Facts

pH
8.1–8.4
diet
herbivore/algae
maxSize
9 inches
salinity
SG 1.020–1.025
minTankSize
75 gallons
temperature
73–81°F (23–27°C)

Temperature

73–81°F

23–27°C

Stats

Community tips0
Kept by0 hobbyists