Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

This dwarf angelfish exhibits a semi-aggressive and highly territorial temperament, particularly toward other members of its genus. It is typically shy and reclusive when first introduced, needing time to acclimate to its surroundings. Once established, it will defend its chosen territory and may harass similar-looking fish or smaller, passive tankmates. It is generally peaceful toward unrelated, active species like wrasses and gobies.

Diet

Omnivore

The Hotumatua Angelfish is an omnivorous grazer that feeds on detritus, microalgae, and tiny benthic invertebrates in nature. In the aquarium, they require a diverse diet consisting of high-quality marine algae, spirulina, and specialized angelfish formulas containing sponge matter. They should also be offered frozen foods such as mysis and brine shrimp to ensure proper nutrition. Supplementing their diet with vitamin-enriched foods will help maintain their vibrant yellow and dark purple coloration.

Life expectancy

5-10 years

Under optimal care in captivity, the Hotumatua Angelfish can live for approximately 5 to 10 years. Their longevity is highly dependent on a varied diet, low stress levels, and stable subtropical water parameters. Maintaining slightly cooler temperatures, around 22–24°C, is beneficial as they originate from subtropical zones. Regular health monitoring and minimizing aggressive tankmates will further support their maximum lifespan.

Sex ratio

Harem

In the wild, these protogynous hermaphrodites form small harems consisting of one dominant male and several females. In the home aquarium, it is best kept as a single specimen to avoid severe territorial aggression. Keeping them in pairs or small groups is only recommended in very large tanks with extensive rockwork, where the largest individual will transition into the dominant male. Introducing all specimens simultaneously as juveniles can minimize the risk of conflict.

Feeding frequency

Twice daily

It is recommended to feed the Hotumatua Angelfish small portions two to three times daily. Because they are active foragers with small digestive systems, they benefit from frequent, small feedings rather than one large meal. Constant grazing opportunities on live rock also help satisfy their natural feeding habits throughout the day. Under-feeding can lead to nutritional deficiencies and increase the likelihood of them nipping at corals.

Bioload

Low to Medium

The Hotumatua Angelfish has a low-medium bioload due to its small adult size of approximately 8 centimeters. While it does not produce a significant amount of waste, it is a constant grazer that requires a mature tank with established live rock. Adequate biological filtration and a reliable protein skimmer are recommended to maintain pristine water conditions. Frequent small water changes will help keep nitrates and phosphates at minimal levels.

Flow

Strong

This species prefers moderate water flow, which mimics the natural movement of their native rocky slopes and reefs. The current should be strong enough to keep the water well-oxygenated and clean, but not so overpowering that it prevents the fish from swimming comfortably. Providing low-flow areas, such as caves and deep crevices, is essential to give them spots to rest. A combination of wavemakers and structured rockwork can create the ideal flow dynamics.

Jump risk

Yes

The Hotumatua Angelfish poses a moderate to high jump risk, especially when startled, stressed, or during territorial chases. They can easily leap through small openings in the aquarium lid when darting away from a perceived threat. A tight-fitting lid or a fine mesh screen top is absolutely essential to prevent accidental escapes. It is also helpful to keep the lighting dim during acclimation to reduce their stress and jumping behavior.

Reproduction

Rare / not documented

Reproduction in captivity is extremely difficult and rarely documented for the Hotumatua Angelfish. They are broadcast spawners that perform a rising courtship ritual at dusk to release pelagic eggs into the water column. While some dwarf angelfish species have been bred by specialists, raising the microscopic larvae requires highly specialized live foods like copepods. Consequently, there are no commercial breeding programs, and all specimens in the hobby are wild-caught.

Compatibility & tankmates

Territorial

The Hotumatua Angelfish is considered reef-safe with caution, as it is known to nip at large polyp stony (LPS) corals, zoanthids, and clam mantles. It is highly compatible with active, reef-dwelling species such as wrasses, gobies, and larger, semi-aggressive fish. It should not be housed with other dwarf angelfish or fish of similar shape and color unless the tank is exceptionally large. Careful monitoring is advised when introducing this species to a reef tank to ensure corals are not damaged.

Tank level

Middle/Bottom

This species primarily occupies the bottom-middle levels of the aquarium, remaining close to the safety of rockwork. They are shy by nature and spend much of their time darting in and out of crevices, caves, and overhangs. They rarely venture into the upper open-water zones unless feeding or during spawning rituals. Providing plenty of rocky structures is crucial to replicate their natural habitat and make them feel secure.