Acanthurus nigricans (Whitecheek Tang / Goldrim Tang)
• Small fish safe: ✅ Yes
• Small invert safe: ✅ Yes
• Coral safe: ✅ Yes
• Minimum tank size: 400L+
• Adult size: ~21 cm
• Diet: Herbivorous (marine algae, seaweed, spirulina-based flakes/pellets, occasional meaty foods)
• Be aware of: Can be aggressive towards other tangs, especially those of similar shape or colour. Requires ample swimming space, strong water flow, and a diet rich in marine algae to maintain health and coloration. Prone to marine ich if stressed.
Whitecheek Tang (Acanthurus nigricans) – A Graceful and Active Reef Species
The Whitecheek Tang, also known as the Goldrim Tang, is a striking species belonging to the Acanthuridae family, commonly found in the Indo-Pacific region. This species is known for its elegant appearance, active swimming behaviour, and algae-grazing habits, making it a valuable addition to a well-maintained reef aquarium.
Appearance and Identification
Whitecheek Tangs are easily recognizable by their deep, velvety blue-black bodies with a contrasting bright yellow band running along the edge of their dorsal and anal fins. They also feature a distinctive white patch on their cheeks, which gives them their common name. A thin golden outline runs along the body, leading to a sharp, scalpel-like spine at the base of the tail—a characteristic feature of all tang species.
Natural Habitat and Behaviour
This species naturally inhabits coral reefs, lagoons, and outer reef slopes at depths of 2 to 40 metres, where it grazes on algae-covered rocks. Whitecheek Tangs are highly active swimmers, constantly patrolling their territory in search of food. In the wild, they often form loose groups but can also be seen swimming solo.
In captivity, they require plenty of open swimming space and rock structures to mimic their natural environment. They are best kept as a single specimen in most aquariums, as they can be aggressive toward conspecifics or similarly shaped tang species.
Tank Requirements and Water Parameters
Whitecheek Tangs are highly active fish that require a large tank to support their constant movement and foraging behaviour.
• Minimum tank size: 400 litres+ (preferably larger for long-term care)
• Temperature: 23–26°C
• pH: 8.1–8.4
• Salinity: 1.020–1.025
• Water movement: Strong, with high oxygenation
• Filtration: High-quality filtration and protein skimming recommended due to high activity levels and waste production
They do best in mature reef tanks with stable water parameters and plenty of live rock for grazing.
Diet and Feeding
Whitecheek Tangs are primarily herbivorous, feeding on macroalgae and filamentous algae in the wild. In captivity, their diet should consist of:
• Dried seaweed (Nori) – Essential for their digestive health
• Spirulina-based flakes and pellets – Helps maintain their colouration
• Fresh macroalgae – If available, such as chaetomorpha or gracilaria
• Occasional meaty foods – Enriched brine shrimp or mysis shrimp (as a supplement, not a staple)
Frequent feeding is recommended, at least 2-3 times per day, to ensure they receive enough nutrients. A diet rich in marine algae helps prevent common health issues such as head and lateral line erosion (HLLE).
Compatibility and Tank Mates
While generally peaceful towards other fish, Whitecheek Tangs can become territorial, especially toward other tangs or surgeonfish. It is best to introduce them as one of the last fish in the tank to reduce aggression.
Good tank mates include:
✔ Peaceful wrasses
✔ Clownfish
✔ Angelfish (dwarf and larger species)
✔ Gobies and blennies
✔ Anthias
Avoid housing with:
❌ Other tangs or surgeonfish of similar shape (e.g., Powder Blue Tang, Achilles Tang)
❌ Extremely aggressive fish that may stress them (e.g., Triggerfish)
Health and Disease Considerations
Whitecheek Tangs are prone to marine ich (Cryptocaryon irritans) and other parasitic infections, particularly when stressed or introduced to a new tank. It is highly recommended to quarantine new specimens before adding them to a display tank. Maintaining optimal water quality and a stress-free environment significantly reduces disease risks.
Lifespan and Long-Term Care
With proper care, Whitecheek Tangs can live 10+ years in captivity. Their long lifespan, combined with their active nature and dietary needs, makes them best suited for experienced marine aquarists or those willing to provide the appropriate tank size and diet.