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The Powder Brown Surgeonfish (Acanthurus japonicus), also widely recognized as the White-Faced Surgeonfish or Japan Surgeonfish, is an exceptionally elegant, highly active marine fish native to the clear, current-swept coral reefs and steep drop-offs of the Western Pacific. Often confused with the similar Powder Brown Acanthurus nigricans, this specific species is highly prized by advanced reef keepers for its softer color tones, striking facial markings, and continuous grazing activity, making it both a beautiful centerpiece and an industrious biological utility for heavy turf algae control.
Core Biological Profile
Maximum Adult Size: Grows into an incredibly athletic, powerful swimmer, reaching an average size of 7 to 8 inches (18 to 20 cm) in captivity.
Minimum Tank Volume: Requires a large aquarium of at least 125 Gallons (473 Liters) featuring a minimum six-foot horizontal swimming highway to support its constant, high-velocity pacing.
Temperament & Compatibility: Semi-aggressive and territorial. It is generally peaceful toward 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 Brown Surgeonfish is understated yet deeply complex. It showcases an oval-shaped body draped in a smooth, velvety chocolate-brown to smoky gray base color. This dark shield is highlighted by a brilliant neon-yellow stripe that tracks cleanly along the base of both its dorsal and anal fins, flaring into a vivid orange band on the rear portion of the dorsal fin.
Its head features a striking, high-contrast white patch or "face mask" located directly under the eye, extending down to the upper lip line. The caudal peduncle houses a sharp, retractable white spinal barb (the "scalpel") used for defense, which transitions into a beautiful, pale blue tail fin ringed by a stark white margin.
The Powder Brown Surgeonfish (Acanthurus japonicus), also widely recognized as the White-Faced Surgeonfish or Japan Surgeonfish, is an exceptionally elegant, highly active marine fish native to the clear, current-swept coral reefs and steep drop-offs of the Western Pacific. Often confused with the similar Powder Brown Acanthurus nigricans, this specific species is highly prized by advanced reef keepers for its softer color tones, striking facial markings, and continuous grazing activity, making it both a beautiful centerpiece and an industrious biological utility for heavy turf algae control.
Core Biological Profile
Maximum Adult Size: Grows into an incredibly athletic, powerful swimmer, reaching an average size of 7 to 8 inches (18 to 20 cm) in captivity.
Minimum Tank Volume: Requires a large aquarium of at least 125 Gallons (473 Liters) featuring a minimum six-foot horizontal swimming highway to support its constant, high-velocity pacing.
Temperament & Compatibility: Semi-aggressive and territorial. It is generally peaceful toward 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 Brown Surgeonfish is understated yet deeply complex. It showcases an oval-shaped body draped in a smooth, velvety chocolate-brown to smoky gray base color. This dark shield is highlighted by a brilliant neon-yellow stripe that tracks cleanly along the base of both its dorsal and anal fins, flaring into a vivid orange band on the rear portion of the dorsal fin.
Its head features a striking, high-contrast white patch or "face mask" located directly under the eye, extending down to the upper lip line. The caudal peduncle houses a sharp, retractable white spinal barb (the "scalpel") used for defense, which transitions into a beautiful, pale blue tail fin ringed by a stark white margin.