Juvenile Ctenochaetus cyanocheilus 2-4 cm

Ctenochaetus cyanocheilus: an active, discreet, and resilient grazing surgeonfish

The Ctenochaetus cyanocheilus is a surgeonfish specialized in grazing on biofilms and benthic particles. With a moderate adult size (about 15 cm), it is distinguished by its ability to adapt to different reef environments and its generally peaceful behavior towards other acanthurids.

In its juvenile stage, this fish exhibits a bright yellow coloration, which gradually evolves into darker, more nuanced tones in adulthood. Its body is elongated and marked with characteristic striations of the Ctenochaetus genus, sometimes with bluish reflections. It is an indefatigable grazer, spending its time exploring the substrate, live rocks, and glass in search of organic matter to consume.

Calm but territorial behavior in restricted space

The ctenochaetus cyanocheilus is known for its tolerance towards other surgeonfish in a sufficiently large tank. However, it can become more reactive with blennies if the space is too limited or poorly arranged. Harmonious cohabitation therefore requires a thoughtful arrangement of the decor, with retreat areas and a well-defined swimming space.

It is advised not to keep it with other territorial bottom fish in a reduced volume, as tensions may arise. In a 200-liter or larger aquarium, well-structured, it shows calm behavior and good sociability.

A decor adapted to its natural behavior

In an aquarium, this grazing surgeonfish needs a sandy bottom and numerous rocks that it can scrape for food. It does not dig but uses its specialized rasp-shaped mouth to clean surfaces. It thus consumes detritus, brown algae, diatoms, and biofilms, playing an essential role in maintaining the biological balance of the tank.

Good water movement, adequate oxygenation, and lighting suitable for the development of algae beneficial to its nutrition are all favorable elements for its health and active behavior.

A diet based on grazing and plants

The ctenochaetus cyanocheilus primarily feeds on organic plant matter. It should receive:

• Nori algae attached to a support or clips.
• Vegetable pellets and flakes enriched with spirulina.
• Occasional supplements of plankton or brine shrimp to vary its diet without unbalancing it.

This diet supports its natural robustness and promotes healthy digestion and stable behavior, even in the presence of other species.

A robust fish for experienced aquarists

The Ctenochaetus cyanocheilus is a fish that is very resilient and easy to maintain in a well-thought-out environment. Thanks to its natural cleaning function, it provides real help in controlling organic excess and managing undesirable algae.

For aquarists looking for an active, discreet, and useful surgeonfish, the cyanocheilus surgeonfish is an excellent choice, especially to complement the population of a medium to large reef tank.