Randall's Anthias (Pseudanthias randalli) – Complete Care Guide

General Information

Randall's Anthias (Pseudanthias randalli) is a stunning and vibrant species of anthias that has captured the hearts of reef aquarists. Known for its striking pink and orange hues, this fish is a true showstopper in any aquarium. It was named in honor of the ichthyologist John E. Randall, who made significant contributions to marine biology. Found in the Indo-Pacific region, particularly around the Maldives and Sri Lanka, this species inhabits deep reefs and is often seen in small groups hovering near coral outcroppings.

This species is a favorite among aquarists due to its vivid coloration and relatively peaceful demeanor. However, it requires specific care and attention, making it more suitable for intermediate to advanced hobbyists. Its natural schooling behavior and dynamic swimming patterns add life and movement to reef tanks, making it a prized addition for those who can meet its needs.

Care

Randall's Anthias thrives in well-established reef aquariums with plenty of swimming space and hiding spots. A tank with live rock and coral structures mimicking its natural habitat is ideal. This species prefers stable water conditions and requires excellent filtration to maintain high water quality. Moderate to strong water flow is recommended to replicate the currents of its natural environment.

This species is best kept in groups, with one dominant male and several females, as it exhibits protogynous hermaphroditism—females can transition to males if the dominant male is absent. A tank size of at least 300 liters (80 gallons) is recommended for a small group to ensure they have ample space to establish territories and reduce stress.

Diet and Feeding

In the wild, Randall's Anthias feeds on zooplankton, making it a planktivore. In captivity, it requires a varied diet of high-quality frozen foods such as mysis shrimp, brine shrimp, and finely chopped seafood. Supplementing with enriched foods and marine-specific pellets or flakes ensures proper nutrition and vibrant coloration.

Feed them small portions multiple times a day, as their high metabolism requires frequent feeding. Observing their feeding behavior can help ensure all individuals in the group are getting enough food, especially in a community tank where competition may occur.

Behavior and Compatibility

Randall's Anthias is generally peaceful and thrives in a social environment. It is best kept in a harem with one male and several females to replicate its natural social structure. While it is compatible with a wide range of reef-safe fish, avoid housing it with overly aggressive or territorial species that may outcompete it for food or space.

This species is reef-safe and will not harm corals or invertebrates, making it an excellent choice for reef tanks. However, its timid nature means it may take some time to acclimate to a new environment and tank mates.

Reproduction

Like many anthias, Randall's Anthias exhibits protogynous hermaphroditism, where the largest female in the group can transition to male if the dominant male is removed. Breeding in captivity is rare and challenging, as it requires precise environmental conditions and a separate breeding tank. The larvae are delicate and require specialized care, including feeding on rotifers and other microscopic planktonic organisms.

Habitat

In the wild, Randall's Anthias is found in the Indo-Pacific region, particularly around the Maldives, Sri Lanka, and other deep reef areas. It inhabits depths of 20 to 50 meters (65 to 165 feet), where it forms small groups near coral outcroppings. The environment is characterized by clear, warm waters with moderate to strong currents, providing ample planktonic food sources.

To replicate its natural habitat in captivity, provide a tank with plenty of live rock, overhangs, and caves for hiding, along with open swimming areas. Moderate lighting and stable water parameters are essential for its well-being.

Common name: Randall's Anthias