Tomini Tang

The Tomini Tang (Ctenochaetus tominiensis) is a small species of surgeonfish in the family Acanthuridae, native to the western Pacific Ocean. It is a popular marine aquarium fish due to its manageable size, algae-eating behavior, and distinctive coloration.

Key facts

• Scientific name: Ctenochaetus tominiensis

• Common names: Tomini tang, Tomini bristletooth tang

• Family: Acanthuridae

• Habitat: Coral reefs of the western Pacific

• Adult size: Up to 6 inches (15 cm)

Appearance and Identification

The Tomini Tang features a brownish body with yellow and white highlights, particularly on the caudal (tail) and dorsal fins. Juveniles often display brighter coloration that darkens slightly with maturity. Like other Ctenochaetus species, it has comb-like teeth used to graze film algae from rock surfaces.

Habitat and Distribution

Native to coral reef environments, the species ranges from Indonesia and the Philippines to the Solomon Islands and Fiji. It is typically found in shallow lagoons and outer reef slopes where algal growth is abundant, usually at depths up to about 40 meters.

Behavior and Diet

Tomini Tangs are herbivorous grazers that primarily feed on detritus and microalgae. In aquariums, they help control nuisance algae and can be kept with other peaceful reef species. They require substantial swimming space and live rock for grazing, thriving best in well-oxygenated, stable marine systems.

Aquarium Care

Due to its smaller size relative to other tangs, the Tomini Tang adapts well to home aquariums of at least 70 gallons. It prefers moderate water flow and reef-safe conditions. Although generally peaceful, it may show mild territoriality toward similar-shaped fish. A diet of marine algae, spirulina, and vegetable-based foods supports its health and coloration.