Cirrhilabrus rhomboidalis

Datasheet

General Description

The Rhomboid wrasse, also known as the Diamondtail wrasse, belongs to the Labridae family within the Cirrhilabrus genus. These fish are characterized by their vibrant colors, with males often exhibiting more striking hues compared to females. They are generally peaceful but can show aggression towards closely related species, particularly the males. They may change gender from male to female and vice versa, with males displaying color flashes during courtship. Wrasses like the Rhomboid wrasse are commonly found in reef aquariums due to their attractiveness and their role in controlling unwanted invertebrates.

Aquarium Suitability

Rhomboid wrasses are suitable for most aquarium setups, but caution must be taken with tank mates as they can be aggressive towards similar species or fish that threaten them. To keep them with multiple species, it is advisable to introduce the largest males last. A tank size of at least 100 gallons (400 liters) is recommended, with larger tanks preferred, especially for housing multiple individuals. These wrasses are sensitive during transportation and acclimatization, requiring a secure lid on the aquarium to prevent jumping.

Demands, Care and Hardiness

This species of wrasse has an average level of hardiness, requiring a well-established aquarium with stable water parameters. They thrive in environments with hiding places, such as live rocks, and need ample space for swimming due to their active nature. Rhomboid wrasses are docile but may become aggressive if not provided with sufficient space or if housed with overly aggressive tank mates. Regular feeding, at least twice daily, is essential for their health and color vibrancy.

Reef Suitability

Rhomboid wrasses are considered reef-safe and can be beneficial additions to reef aquariums due to their invertebrate-controlling behavior. They should acclimatize well to reef conditions and contribute to the overall balance of the ecosystem.

Aquarium Setup

When setting up an aquarium for Rhomboid wrasses, ensure there are plenty of hiding spots among live rocks. Maintaining stable water parameters within the range of pH 8.1-8.4, a specific gravity of 1.020-1.025, and a temperature between 22.2-25.6 degrees Celsius (72-78 degrees Fahrenheit) is crucial for their well-being.

Behaviour

These wrasses can exhibit territorial behavior, especially among males. It is recommended to keep them in pairs (one male and one female) or one male with multiple females to reduce aggression within the group. Observing their interactions during feeding and ensuring they are active are essential aspects of monitoring their health in captivity.

Feeding and Diet

Rhomboid wrasses primarily feed on frozen and flake foods of appropriate size. A varied and high-quality diet, including small crustaceans like krill and mysis, as well as zooplankton such as cyclops and pods, helps maintain their health and coloration. Feeding them multiple times a day is recommended, especially during the acclimatization period.

Dimorphism

Male and female Rhomboid wrasses can exhibit significant differences in coloration, with males often showcasing more vibrant and varied shades. Males may change gender to female and vice versa, illustrating the species' hermaphroditic nature. Monitoring their behavior and color changes can provide insights into their reproductive biology and social dynamics.

Habitat and Distribution

The Rhomboid wrasse is native to the Western Central Pacific, specifically found in areas like Kwajalein Atoll in the Marshall Islands. In the wild, these wrasses inhabit coral reef ecosystems, where they play a crucial role in maintaining the balance of marine life by feeding on a variety of invertebrates and small crustaceans.