Description
Powder Brown Tang (Acanthurus japonicus)
Overview
The Powder Brown Tang (Acanthurus japonicus), also known as the Japan Surgeonfish, is a stunning, active, and popular marine fish for reef aquariums. While highly rewarding, they are considered a more delicate species that requires an experienced aquarist to thrive.
- Max Size: Up to 21–23 cm.
- Temperament: Generally peaceful with non-tang species, but can be semi-aggressive and territorial toward other tangs or fish with similar body shapes.
- Reef Safe: Yes, they typically leave corals and invertebrates alone.
Care Requirements
- Tank Size: A minimum of 300-400 litres is recommended. Because they are constant, active swimmers that travel large distances in the wild, they need significant horizontal swimming space.
- Water Parameters:
- Temperature: 22–26°C
- pH: 8.1–8.4
- Salinity: 1.020–1.025 SG
- Environment:
- Live Rock: Essential for providing grazing surfaces (algae growth) and hiding spots (crevices).
- Flow: Strong water movement is recommended to mimic their natural environment and keep oxygen levels high.
- Lid: A secure, tight-fitting mesh or netted lid is mandatory, as they are known to jump when stressed.
Maintenance
- Stable Environment: They are prone to Marine Ich (Cryptocaryon irritans) and are often sensitive during transportation and initial acclimation. Quarantine is strongly recommended for 2–4 weeks.
- Water Quality: Maintaining pristine water conditions is vital. High-quality filtration and consistent weekly water changes are necessary.
- Flow: Strong water movement is recommended to mimic their natural environment and keep oxygen levels high.
Diet
- Primary Diet: They are herbivores. Their health depends on grazing on marine algae.
- Feeding Frequency: Feed small portions 2–3 times daily to match their natural grazing behavior.
- Foods:
- Provide high-quality dried seaweed (Nori) on a veggie clip and algae-based pellets/flakes.
- Supplement their diet with occasional meaty foods like mysis or brine shrimp.
- Tip: It is highly recommended to have an established aquarium with natural algae growth before introducing this fish, as they can be picky eaters during the initial
Behavior and Compatibility
- Social Behavior: They are generally peaceful with non-tang species, but can be semi-aggressive and territorial toward other tangs or fish with similar body shapes.
- The “Scalpel”: Like all surgeonfish, they have a sharp “scalpel” at the base of their tail. Be extremely careful when handling or netting them, as these can cause painful wounds and damage nets.
- Compatibility: Best added to a well-established system and should generally be one of the last fish introduced to the tank to prevent them from becoming targets for established, aggressive tank mates.
Reproduction
Like other members of the Acanthuridae family, they spawn in open water. Breeding in a home aquarium is not considered feasible for the average hobbyist.
Tips
- Acclimation: They can be sensitive to the stress of moving. Ensure your specimen is actively eating in the store before bringing it home.
- Prevention of Disease: Because they are prone to stress-related illness and nutritional deficiencies (like Head and Lateral Line Erosion), they are best suited for advanced hobbyists who can maintain pristine water quality and provide a diverse, algae-heavy diet.
- Placement: Avoid keeping them with other tangs to minimize aggression.
Picture for illustrative purposes only. Either come in store to view available stock or request pictures to be sent to you.
Please Note: Due to variations within species resulting from age, region, sex, etc., the actual livestock may not look identical to the image. Approximate size range may also vary between individual specimens.
