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The Powder Blue Surgeonfish (Acanthurus leucosternon), often referred to simply as the Powder Blue Tang, is one of the most iconic, breathtakingly vibrant marine fish in the aquarium hobby. Native to the shallow, high-energy coral reefs and seaward drop-offs of the Indian Ocean, this active open-water swimmer brings unmatched visual energy to large marine displays. Highly prized for its striking coloration, it also serves as an industrious biological utility for heavy, continuous turf algae control in mature systems.
Core Biological Profile
Maximum Adult Size: Grows into a large, incredibly athletic swimmer, reaching an average size of 8 to 10 inches (20 to 25 cm) in captivity.
Minimum Tank Volume: Requires a vast aquarium of at least 125 to 150 Gallons (473 to 568 Liters) featuring a minimum six-foot horizontal swimming highway to support its constant, high-velocity pacing.
Temperament & Compatibility: Aggressive and intensely territorial. It is generally safe around non-tang tankmates but will fiercely defend its grazing territory against other surgeonfish, especially similarly shaped Acanthurus species or fish introduced after it has established dominance.
Reef Safe Status: 100% Reef Safe. They possess absolute zero biological interest in nipping at or damaging soft corals, large polyp stony (LPS) corals, small polyp stony (SPS) corals, clams, or decorative invertebrates.
High-Contrast Aesthetics and Dynamic Display
The visual presentation of the Powder Blue Tang is ultra-high-contrast and unmistakable. It showcases an oval-shaped, electric sky-blue body paired with a striking oval black mask that completely covers its head and face. This dark face is brilliantly bordered by a crisp white throat chest-bib. Its dorsal fin is a solid, neon chartreuse-yellow, while its anal and pelvic fins shine in stark white. The tail fin features a beautiful white base band framed by vertical black margins.
Like many open-water surgeonfish, it possesses sharp, modified scales on either side of its caudal peduncle—the caudal spines (or "scalpels")—which it will flash defensively during territorial disputes.
The Powder Blue Surgeonfish (Acanthurus leucosternon), often referred to simply as the Powder Blue Tang, is one of the most iconic, breathtakingly vibrant marine fish in the aquarium hobby. Native to the shallow, high-energy coral reefs and seaward drop-offs of the Indian Ocean, this active open-water swimmer brings unmatched visual energy to large marine displays. Highly prized for its striking coloration, it also serves as an industrious biological utility for heavy, continuous turf algae control in mature systems.
Core Biological Profile
Maximum Adult Size: Grows into a large, incredibly athletic swimmer, reaching an average size of 8 to 10 inches (20 to 25 cm) in captivity.
Minimum Tank Volume: Requires a vast aquarium of at least 125 to 150 Gallons (473 to 568 Liters) featuring a minimum six-foot horizontal swimming highway to support its constant, high-velocity pacing.
Temperament & Compatibility: Aggressive and intensely territorial. It is generally safe around non-tang tankmates but will fiercely defend its grazing territory against other surgeonfish, especially similarly shaped Acanthurus species or fish introduced after it has established dominance.
Reef Safe Status: 100% Reef Safe. They possess absolute zero biological interest in nipping at or damaging soft corals, large polyp stony (LPS) corals, small polyp stony (SPS) corals, clams, or decorative invertebrates.
High-Contrast Aesthetics and Dynamic Display
The visual presentation of the Powder Blue Tang is ultra-high-contrast and unmistakable. It showcases an oval-shaped, electric sky-blue body paired with a striking oval black mask that completely covers its head and face. This dark face is brilliantly bordered by a crisp white throat chest-bib. Its dorsal fin is a solid, neon chartreuse-yellow, while its anal and pelvic fins shine in stark white. The tail fin features a beautiful white base band framed by vertical black margins.
Like many open-water surgeonfish, it possesses sharp, modified scales on either side of its caudal peduncle—the caudal spines (or "scalpels")—which it will flash defensively during territorial disputes.