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Atlantic Blue Tang
Acanthurus coeruleus
Animalia›Chordata›Actinopterygii›Acanthuriformes›Acanthuridae
📍 Atlantic Ocean, Caribbean to Brazil
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.
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.
Tank Mates
Peaceful reef fish with similar saltwater requirements; unlikely to compete with tang's herbivorous diet
Beneficial symbiotic relationship; tang tolerates shrimp and benefits from parasite removal
Small, peaceful fish that occupies different niche; provides cleaning services without competing
Algae-eating snail that complements tang's grazing; no territorial conflict
Hardy algae grazer that works alongside tang without competition or aggression
Common Diseases
Marine Ich (White Spot Disease)
White spots on body and fins, rapid breathing, flashing against rocks, lethargy
Increase water temperature to 26-27°C, maintain excellent water quality, consider copper-based treatments or hyposalinity therapy; quarantine infected fish
Fin Rot
Frayed or deteriorating fin edges, discoloration at fin margins, progressive fin loss
Improve water quality and reduce stress; perform frequent water changes; use antibiotic treatments if bacterial infection confirmed
Head and Lateral Line Erosion (HLLE)
Pitting or erosion of head and lateral line, loss of flesh around sensory organs
Improve diet with vitamin-enriched foods, especially vitamin C and quality algae; ensure excellent water quality and reduce stressors
Parasitic Infections
Excessive scratching, visible parasites, cloudy eyes, behavioral changes, loss of appetite
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