Acanthurus coeruleus (Atlantic Blue Tang / Caribbean Blue Tang / Blue Tang Surgeonfish)
• Small fish safe: ✅ Yes
• Small invert safe: ✅ Yes
• Coral safe: ✅ Yes
• Minimum tank size: 380 liters (100 gallons)
• Adult size: Up to 39 cm (15 inches)
• Diet: Primarily herbivorous; requires a diet rich in marine-based seaweed and algae
• Be aware of: Can be territorial, especially towards conspecifics; requires ample swimming space and a well-established aquarium with abundant live rock for grazing
Atlantic Blue Tang (Acanthurus coeruleus) – A Vibrant and Active Reef Inhabitant
The Atlantic Blue Tang, also known as the Caribbean Blue Tang or Blue Tang Surgeonfish, is a striking and active member of the surgeonfish family. Its vibrant coloration and dynamic swimming behavior make it a captivating addition to marine aquariums.
Appearance and Coloration
The Atlantic Blue Tang exhibits notable color changes throughout its life:
• Juveniles: Bright yellow with blue accents around the eyes and fins.
• Adults: Transition to a rich blue or purplish-blue hue, often with darker longitudinal lines and a yellow or white spine on the caudal peduncle.
These color transformations add to the allure of this species in home aquariums.
Natural Habitat and Behavior
In the wild, Atlantic Blue Tangs are typically found in:
• Habitat: Coral reefs and inshore grassy or rocky areas in the Western Atlantic, including the Gulf of Mexico and the Caribbean Sea.
• Behavior: Active swimmers and grazers, often seen feeding on algae-covered surfaces throughout the day.
In captivity, they require ample space to swim and graze, as well as plenty of live rock to establish territories and provide grazing surfaces.
Tank Requirements and Water Parameters
Due to their active nature and potential size, Atlantic Blue Tangs require a spacious and well-maintained aquarium:
• Minimum Tank Size: 380 liters (100 gallons)
• Temperature: 23–26°C (73–79°F)
• pH: 8.1–8.4
• Salinity: Specific gravity of 1.020–1.025
• Water Movement: Moderate to strong, replicating natural reef conditions
• Aquascaping: Ample live rock to create hiding spots and grazing areas, while ensuring open spaces for swimming
Maintaining high water quality and stable parameters is essential for their health and well-being.
Diet and Feeding
As herbivores, Atlantic Blue Tangs require a diet rich in marine-based vegetation:
• Primary Diet: Marine-based seaweed and algae
• Feeding Frequency: Offer dried seaweed tied to a rock or use a veggie clip at least three times per week.
• Recommended Products: Sea Veggies, Seaweed Salad, and Ocean Nutrition are ideal options.
A diet rich in marine algae will strengthen their immune system, reduce aggression, and improve overall health.
Compatibility and Tank Mates
Atlantic Blue Tangs are generally peaceful but can exhibit territorial behavior, especially towards conspecifics:
• Compatible Tank Mates: Most community saltwater fish that are non-aggressive and dissimilar in appearance
• Caution With: Other tangs or surgeonfish, especially those of similar shape or coloration, unless housed in a sufficiently large aquarium
Introducing them into a well-established tank with ample space can help mitigate territorial behaviors.
Health and Disease Considerations
Atlantic Blue Tangs are relatively hardy but can be susceptible to common marine diseases:
• Marine Ich: Maintain optimal water quality and a nutritious diet to prevent outbreaks
• Head and Lateral Line Erosion (HLLE): Associated with poor water quality and inadequate nutrition; ensure a balanced diet and pristine conditions
Regular monitoring and maintaining optimal water conditions are essential for their well-being.
Lifespan and Long-Term Care
With proper care, Atlantic Blue Tangs can live for several years in captivity. Their longevity is enhanced by providing a spacious environment, a balanced diet, and regular health monitoring.
Why Choose an Atlantic Blue Tang?
• Algae Control: As natural grazers, they assist in managing algae growth within the tank
• Visual Appeal: Their distinctive coloration and active behavior make them a captivating addition to marine aquariums
• Hardiness: With proper care, they adapt well to captive environments and can thrive for many years
The Atlantic Blue Tang is a beneficial and attractive choice for aquarists seeking both aesthetic appeal and functionality in algae management.