Thompson's Anthias (Pseudanthias thompsoni) – Complete Care Guide

General Information

The Thompson's Anthias (Pseudanthias thompsoni) is a stunning and relatively peaceful reef fish, known for its vibrant orange body with subtle yellow highlights. This species is a favorite among aquarists due to its striking coloration and schooling behavior, making it an excellent choice for adding movement and vibrancy to a reef tank. Native to the Indo-Pacific, particularly around the Hawaiian Islands, this species is often found in deeper reef environments.

Unlike some other anthias species, Pseudanthias thompsoni is relatively hardy and adaptable, making it a suitable choice for intermediate to experienced aquarists. Its natural schooling behavior in the wild makes it a fascinating addition to larger tanks, where groups can display their dynamic social interactions.

Care

Thompson's Anthias thrive in well-established reef aquariums with plenty of swimming space and live rock for hiding. They prefer tanks with moderate to high water flow and stable water parameters. These fish are sensitive to poor water quality, so maintaining pristine conditions is essential.

A tank size of at least 300 liters is recommended for a small group, as they are active swimmers and require ample space. Providing caves and overhangs mimics their natural habitat and offers them security. While they are not dependent on anemones or specific corals, a reef-like setup enhances their well-being.

Diet and Feeding

In the wild, Pseudanthias thompsoni are planktivores, feeding on zooplankton and other small suspended particles. In captivity, they require a varied diet to meet their nutritional needs. Offer high-quality frozen foods such as mysis shrimp, brine shrimp, and finely chopped seafood, supplemented with marine pellets or flakes formulated for carnivorous fish.

Feed them small portions multiple times a day to mimic their natural feeding habits. This frequent feeding schedule helps maintain their energy levels and vibrant coloration. Using an automatic feeder can be beneficial for aquarists with busy schedules.

Behavior and Compatibility

Thompson's Anthias are peaceful and best kept in groups, ideally in a harem structure with one male and several females. This setup mimics their natural social hierarchy and reduces stress. They are generally compatible with other peaceful reef fish, such as gobies, wrasses, and tangs. Avoid housing them with overly aggressive or territorial species, as this can lead to stress and health issues.

While they are reef-safe, care should be taken to ensure they are not outcompeted for food by faster or more aggressive tank mates. Providing multiple feeding stations can help ensure all individuals in the group receive adequate nutrition.

Reproduction

Like many anthias species, Pseudanthias thompsoni are protogynous hermaphrodites, meaning all individuals are born female, and the dominant individual in a group transitions to male. Breeding in captivity is rare but not impossible, requiring a dedicated breeding setup with stable water conditions and a separate tank for raising fry. The fry require specialized care, including feeding on rotifers and other microscopic foods.

Habitat

In the wild, Pseudanthias thompsoni inhabit deeper reef slopes and drop-offs, typically at depths of 20 to 60 meters. They are found in the Indo-Pacific region, with a notable presence around the Hawaiian Islands. These environments are characterized by clear, warm waters and abundant plankton, which forms their primary diet.

To replicate their natural habitat, provide a tank with moderate to high water flow, plenty of live rock for shelter, and open swimming areas. Maintaining stable water parameters and temperature is crucial for their health and well-being.

Common name: Thompson's Anthias