Common name: Squaretail Bristletooth

General Information

The Squaretail Bristletooth, scientifically known as Ctenochaetus truncatus, is a distinctive species of tang found in the aquarium trade. Known for its unique mouth shape and bristle-like teeth, this fish is particularly adept at grazing on algae, making it a helpful addition to reef tanks. Its body is typically a muted brown or gray, adorned with a striking gold ring around its eyes, which gives it its alternative common name Indian Gold Ring Bristletooth.

While not as popular as some other tang species, the Squaretail Bristletooth is appreciated by hobbyists for its algae-eating abilities and relatively peaceful nature. This species plays a crucial role in maintaining the ecological balance of coral reefs by controlling algae growth, which can otherwise smother corals.

Care

Ctenochaetus truncatus is suitable for intermediate to experienced aquarists due to its specific dietary needs and space requirements. It thrives in well-established aquariums with plenty of live rock, which provides both grazing surfaces and hiding spots. A tank size of at least 300 liters is recommended to accommodate its active swimming habits and territorial nature.

To replicate its natural habitat, ensure the tank has strong water flow and ample rockwork. This setup not only mimics the conditions found in the wild but also encourages natural foraging behavior, keeping the fish engaged and healthy.

Diet and Feeding

In the wild, the Squaretail Bristletooth primarily feeds on algae and detritus. In captivity, its diet should consist mainly of marine algae, spirulina, and high-quality herbivore pellets. Offering a variety of foods, including nori and blanched vegetables like zucchini, can help meet its nutritional needs and prevent dietary deficiencies.

Feed this species multiple times a day in small amounts to mimic its natural grazing habits. Ensuring a steady supply of algae in the tank will also support its dietary requirements.

Behavior and Compatibility

Ctenochaetus truncatus is generally peaceful but can exhibit semi-aggressive behavior towards other tangs, especially in smaller tanks. It is best kept as the only tang in the aquarium unless housed in a very large setup. This species is otherwise compatible with a wide range of peaceful reef fish and invertebrates.

Its peaceful nature makes it suitable for community tanks, but it may become territorial if space is limited. Providing ample room and plenty of hiding spots can help mitigate aggressive tendencies.

Health and Common Issues

With proper care, Ctenochaetus truncatus can live for several years in captivity. Maintaining high water quality and a balanced diet are key to its longevity. Regular monitoring for signs of stress or disease, such as ich or lateral line erosion, is important.

When selecting a specimen, look for active fish with clear eyes and smooth, intact fins. Avoid individuals with visible signs of disease or injury.

Habitat

Native to the Indian Ocean, including the Maldives and Sri Lanka, Ctenochaetus truncatus inhabits coral-rich areas and lagoons. It prefers environments with abundant live rock and moderate water flow, which support its natural grazing behavior.