Overview
The Powder Brown Tang (Acanthurus japonicus) is a intermediate saltwater species known for its brown, white face, orange tail, yellow dorsal coloration. Brown body with white face mask and orange tail. Mid.
Origin & Appearance
Origin: Western Pacific.
Colors: Brown, White face, Orange tail, Yellow dorsal.
Body Shape: Moderately Compressed (oval-flat). Typical adult dimensions: 21.0 x 3.1 x 9.5.
Sexual Dimorphism: Minimal.
Tank & Water Requirements
| Min Tank Size | 125 gallons |
| Temperature | 75–79°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | high |
| Oxygen Demand | high |
| Plant Safe | yes |
| Aquarium Position | Mid |
Behavior & Activity
Active reef cruiser; steady grazing movement; territorial patrol; typical tang swimming
Speed: 65/100Aggression: 5/10diurnal
Breeding
Not bred at home; pelagic spawner
Common Diseases
💊 Marine ich (crypto)💊 very prone
Expert Notes
Brown body with white face mask and orange tail