Blue Surgeonfish

Dive into the azure beauty of the Blue Surgeonfish, scientifically known as Acanthurus leucosternon. This mesmerizing marine species, often referred to as the Blue Powder Tang, is a vibrant addition to coral reefs. In this comprehensive guide, we’ll unravel the mysteries of its size, appearance, native habitat, behavior, dietary preferences, and expert insights for successfully keeping the Blue Surgeonfish in your home aquarium.


The Blue Surgeonfish boasts an average size of 25-30 centimeters (10-12 inches), making it a medium-sized member of the Acanthuridae family. Recognizable by its vibrant powder-blue coloration, it features a distinctive white marking on its chest, accentuating its elegance. The characteristic surgeon’s scalpel, located near its tail, adds a unique touch to its appearance.


Native to the Indo-Pacific region, the Blue Surgeonfish calls the coral-rich waters of the Red Sea, Indian Ocean, and Pacific Ocean home. Thriving in the clear, warm waters of coral reefs, it’s often observed in the shallower regions, making it a popular sighting for divers and aquarium enthusiasts.


Blue Surgeonfish are recognized for their active and social behavior. In their natural habitat, they form schools, gracefully swimming among coral formations. However, it’s essential to note that they may become territorial, particularly towards their own kind, when confined to a smaller space.


Being herbivores, Blue Surgeonfish primarily feed on algae. In an aquarium setting, ensure their diet includes a mix of high-quality herbivorous flakes or pellets. Supplement this with fresh vegetables like spinach and seaweed sheets. A varied diet ensures their nutritional needs are met.

Keeping Blue Surgeonfish at home

Creating a suitable environment for Blue Surgeonfish requires attention to detail. Here are essential guidelines for their well-being:

Tank size: Provide a spacious tank with a minimum capacity of 400 liters (100 gallons) to accommodate the active nature of Blue Surgeonfish. Larger tanks reduce territorial behavior and promote overall well-being.
Water parameters: Maintain a stable water temperature between 23-28°C (73-82°F) and a pH level of 8.1-8.4. The salinity should range from 1.020 to 1.025. Adequate water flow and strong filtration are essential to replicate their natural habitat.
Aquarium setup: Create an environment mimicking a coral reef with live rock structures, caves, and hiding spots. Ensure there’s plenty of open swimming space and avoid placing sharp objects that may damage their delicate fins.
Tank mates: Blue Surgeonfish are generally peaceful but may show aggression towards their own kind. Compatible tank mates include other non-aggressive fish species with similar water requirements.

The Blue Surgeonfish, with its enchanting blue hues and graceful demeanor, is a captivating addition to marine aquariums. By understanding their size, appearance, behavior, and dietary needs, you can create a thriving underwater haven within your home. Embrace the opportunity to care for Acanthurus leucosternon, and you’ll be rewarded with endless moments of fascination and the joy of witnessing the vibrant beauty of the ocean in your own aquarium sanctuary.

Scientific nameAcanthurus leucosternon
Type of aquariumMarine
Size25-30 cm / 10-12 inches
Ideal tank size400 liters / 100 gallons
Ideal water temperature23-28 °C / 73-82 °F
DietHerbivorous, algae, herbivore pellets, vegetables
ReproductionLimited information
Life spanVaries, around 5-10 years
SchoolingTends to form schools but may exhibit territorial behavior in captivity.

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