Tricolor Anthias saltwater fish care guide

Pseudanthias rubrizonatus is a reef-associated anthias from the Indo-West Pacific, ranging from the Andaman Sea and Southeast Asia east toward Fiji and the Solomon Islands, north to Japan, and south to Australia and the Great Barrier Reef. Males wear a pinkish orange body split by a vivid red vertical bar across the mid-body, with a yellowish rear half; females carry a similar pattern in paler tones with a whitish rear body. Juveniles are identifiable by lavender-tipped dorsal spines. Adults reach roughly 5 inches, and in the wild the species aggregates around isolated coral heads and rubble patches, while juveniles turn up in harbors and on silty rocky reefs.

Adult housing should begin at 100 gallons and emphasize open water. This is a midwater schooling fish that spends its day in the upper and middle portions of the tank, so rockwork belongs along the perimeter and back rather than through the central swimming lane. Build in caves, cracks, and crevices so each individual has a retreat for resting and for escaping pursuit. Strong water movement suits the species well, and a well-established system with stable conditions makes the transition easier. A secure cover is not optional here, as this anthias is a capable jumper.

In nature the Tricolor Anthias feeds on zooplankton and takes animal prey opportunistically from both the water column and the reef surface, including larval fishes, mysids, isopods, and heteropods. Documented shifts in prey with growth reflect a consistently carnivorous habit throughout life. Captive diets should mirror that with small, finely chopped meaty marine foods: mysis shrimp, enriched brine shrimp, squid, shrimp, clam, and fish flesh all work.

Feed at least twice daily, and more frequent small meals are better still given the high metabolic demand of a plankton feeder. Releasing food upstream so it drifts down to the fish reproduces the natural feeding posture and encourages a stronger response than dropping food on the surface. Some newly arrived specimens are reluctant to begin feeding; fortified live adult brine shrimp can be used temporarily to start them, then gradually replaced with frozen or fresh preparations.

Mysis Shrimp Enriched Brine Shrimp Live Adult Brine Shrimp Squid Chopped Shrimp Clam Fish Flesh
Active and social, this anthias occurs in aggregations on the reef and is commonly maintained as a group or harem in captivity. It is best described as somewhat feisty rather than wholly peaceful, and males will not tolerate one another, so keep a single male whether the fish is housed alone or with a group. A workable group structure is one male with eight or more females, which requires a large system with genuine open water. Introduce the anthias late in the stocking sequence so it is not immediately overshadowed by established residents.

Choose tankmates that range from peaceful to moderately assertive and that will not intimidate the anthias away from feeding opportunities. Aquarium references classify the species as coral-safe, reef-safe, and invertebrate-safe, with no reported damage to corals, clams, snails, crabs, or ornamental shrimp. Keep in mind that its natural prey includes small crustaceans and fish larvae, so tiny planktonic organisms drifting through the display are fair game even though sessile and ornamental invertebrates are not.

FAQ

Frequently Asked Questions

About the Tricolor Anthias

  • How large an aquarium does a Tricolor Anthias need?
    Plan on at least 100 gallons for adults, with the bulk of that volume devoted to open swimming space. A group or harem benefits from even more room, since the fish schools in the upper and middle water column.
  • How often should this anthias be fed?
    Offer finely chopped meaty marine foods at least twice daily, with multiple small feedings preferred. Delivering food into the current so it drifts toward the fish mimics the natural capture of plankton.
  • Can it be kept in a reef tank and with other anthias?
    Yes, it is considered reef- and coral-safe and does not bother clams, snails, crabs, or ornamental shrimp. It can be kept as a harem, but only one male should be housed per system, ideally with eight or more females.