Bellus Angelfish

Bellus Angelfish

The Bellus Angelfish (Genicanthus bellus), also called the ornate or swallowtail angelfish, is one of the few angelfish that is truly reef-safe. A member of the swallowtail genus Genicanthus, it is a graceful, mid-water planktivore rather than a coral-grazer — which, combined with its peaceful nature and refined colouring, makes it a prized choice for reef aquarists who normally have to avoid angelfish.

It is also a beautifully dimorphic species: males and females wear quite different patterns, so a pair makes an especially attractive display.

Natural Habitat & Origin

Genicanthus bellus is found across the Indo-Pacific, from Indonesia and the Philippines to Tahiti and the Cook Islands. It is a deep-water fish, occurring at depths of roughly 25 to 100 metres (82–328 feet) on current-swept reefs, where it forms midwater schools and harems of a male with several females.

Its deep-water origin means it appreciates a dimmer, calmer environment than a typical bright shallow-reef fish, with steady flow and plenty of swimming space.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature of about 24–26°C (75–79°F). Reaching up to about 18 cm (7 inches), it needs a roomy tank of around 280 litres (about 75 US gallons) or more with open water to swim. Subdued lighting during acclimation helps a deep-water fish settle.

Healthy, well-acclimated specimens are hardy, though the species can be expensive and is collected from depth, so a careful, well-acclimated import is worth seeking out.

Diet & Feeding

The Bellus Angelfish is essentially planktivorous, feeding on zooplankton in the wild along with some benthic invertebrates and algae. It accepts aquarium foods well: offer frequent small meals of frozen mysis and enriched brine shrimp, marine angel preparations and foods with marine algae content. Frequent feeding suits its natural midwater grazing.

Behavior & Temperament

This is a peaceful, sociable angelfish that can be kept singly, as a pair, or as a male with several females in a large tank. It is not the territorial bully that many angels are, and mixes well in a calm community. It spends its time cruising open water rather than picking at the rocks.

Tank Mates

Good companions are other peaceful reef fish — tangs, anthias, wrasses, gobies and similar. It generally coexists well even with other peaceful angels given space. Crucially, G. bellus is reef-safe: as a planktivore it leaves corals and ornamental invertebrates alone, making it one of the very few angelfish suitable for a full reef.

Breeding

Genicanthus bellus is a protogynous hermaphrodite that forms harems, with a dominant female changing sex to male. It is a pelagic spawner, and rearing the larvae is beyond the home aquarium, so trade specimens are wild-collected from deep reefs.

Common Health Issues

Given good acclimation, the Bellus Angelfish is reasonably hardy, but like all marine fish it is susceptible to marine ich (Cryptocaryon irritans) and marine velvet (Amyloodinium ocellatum), particularly when stressed by deep-water collection and transport. Quarantine new arrivals, acclimate gently with subdued lighting, and keep water quality stable. A well-chosen specimen rewards the effort as a rare, reef-safe angelfish of real elegance.