Common name: Evansi Anthias

General Information

The Evansi Anthias (Pseudanthias evansi) is a stunning and vibrant addition to any reef aquarium. Known for its striking coloration, this species features a gradient of bright yellow on its back transitioning into a soft lavender or pinkish hue on its lower body. This gradient makes it one of the most visually appealing species of anthias available in the aquarium trade. Native to the Indo-Pacific region, particularly around the Maldives, Sri Lanka, and the Great Barrier Reef, the Evansi Anthias is a schooling fish that thrives in groups, making it a popular choice for aquarists looking to add a splash of color and dynamic movement to their tanks.

Despite its beauty, the Evansi Anthias is considered a challenging species to keep, primarily due to its specific dietary needs and sensitivity to water quality. It is often recommended for experienced hobbyists who can provide the stable conditions and specialized care this species requires.

Care

Evansi Anthias require a well-established reef aquarium with plenty of live rock for hiding and grazing. They are highly active swimmers and need ample open space to move around. A tank size of at least 300 liters (approximately 80 gallons) is recommended, especially for a group of these fish. Strong water flow and high oxygen levels are essential to mimic their natural reef environment.

Lighting should be moderate to bright, as this species is accustomed to well-lit reef zones. Maintaining stable water parameters is crucial for their health, as they are sensitive to fluctuations in temperature, salinity, and pH.

Diet and Feeding

In the wild, Evansi Anthias are planktivores, feeding primarily on zooplankton. In captivity, they require a diet rich in small, meaty foods such as copepods, rotifers, and finely chopped mysis or brine shrimp. High-quality frozen and live foods are often necessary to entice them to eat, especially when newly introduced to the aquarium.

Frequent feeding—up to three times a day—is recommended due to their high metabolic rate. Offering a variety of foods can help ensure they receive balanced nutrition. Some aquarists also use automatic feeders to provide small portions of food throughout the day, mimicking their natural feeding habits.

Behavior and Compatibility

Evansi Anthias are peaceful fish that do well in groups, making them ideal for community reef tanks. They exhibit a social hierarchy within their schools, with a dominant male leading a group of females. This harem structure is essential for their well-being, and it is recommended to keep one male with multiple females to replicate their natural social dynamics.

While generally peaceful, they can become stressed if housed with overly aggressive tank mates. Ideal companions include other peaceful reef fish such as gobies, wrasses, and tangs. Avoid housing them with large predatory species that may view them as prey.

Reproduction

Like many anthias species, Evansi Anthias are protogynous hermaphrodites, meaning they are born female and have the ability to change to male if the dominant male in the group is removed or dies. Breeding in captivity is rare and challenging, as it requires precise environmental conditions and a stable social structure. Spawning typically occurs at dusk, with the male performing elaborate courtship displays to attract females.

Health and Common Issues

Evansi Anthias are sensitive to poor water quality and are prone to stress-related illnesses such as marine ich and bacterial infections. Quarantining new additions and maintaining pristine water conditions are essential to their health. Regular water changes, a varied diet, and avoiding overcrowding can help prevent common health issues.

When selecting an Evansi Anthias, look for active individuals with vibrant coloration and no visible signs of disease. Lethargy, faded colors, or labored breathing can indicate underlying health problems.

Habitat

In the wild, Evansi Anthias are found in the warm, tropical waters of the Indo-Pacific, often inhabiting outer reef slopes and lagoons at depths ranging from 10 to 50 meters. They prefer areas with strong currents, which bring a steady supply of planktonic food. Replicating these conditions in captivity is key to their success.