Sixbar Angelfish

Geographical Origin and Habitat: Broadly distributed in the tropical Indo-Pacific, from Indonesia, Philippines, and Solomon Islands to northern Australia and the Great Barrier Reef. Inhabits silty lagoons and outer reef slopes down to 40 meters. They are commonly found in coastal reefs with moderate turbidity, often around structures that provide shelter.

Taxonomy and Morphology: Member of the family Pomacanthidae. Features a deep, compressed body with a sharp opercular spine. Can reach a maximum length of 46 cm. The preopercular spine is highly developed and can cause painful wounds during handling or to potential predators.

Social Behavior: Solitary or in pairs. Shy but highly territorial. Adults produce a loud clicking/grunt warning sound when startled or defending territory. They communicate through low-frequency clicking sounds, especially when defending their caves or during stress.

Coloration and Sexual Dimorphism: Pale yellowish-brown body with 6 vertical black bars. Head is dark with a white vertical bar behind the eye. Juveniles are dark blue with vertical white and blue stripes. No sexual dimorphism. The transformation from juvenile blue stripes to adult vertical bars is a major morphological change.

Aquarium Setup: Requires a massive tank of at least 1000 liters. Rockwork must be stable and leave open swimming paths. Good water flow is required. The aquarium should feature solid, secure rock arches that allow the fish to turn around easily without injury.

Diet and Feeding: Omnivorous. Wild diet consists mainly of sponges, tunicates, and algae. Accepts frozen mysis, krill, chopped seafood, and sponge-based angelfish formulas. Incorporating fresh marine algae and sponge-rich preparations will ensure proper development and shell growth.

Water Quality: Maintain stable values: temperature 24-28 °C, pH 8.1-8.4, salinity SG 1.020-1.025. Heavy protein skimming and regular water changes are required. Keep nitrates low and maintain a high redox potential using ozone or strong chemical filtration.

Compatibility and Cohabitation: Not Reef Safe. Will prey on corals, anemones, and clams. Best kept in a large fish-only setup with active, robust species. Highly destructive to reef setups; it should be kept only in a fish-only tank with larger, active species.

Aquarium Breeding: Broadcast pelagic spawners. No captive breeding records exist in home aquaria due to space and larval feeding limitations. Successful breeding in home aquaria requires deep tanks and is rarely attempted due to the complex larval stages.

Risks and Diseases: Susceptible to Head and Lateral Line Erosion (HLLE) without sponge-rich nutrition. Prone to skin parasites under stressful conditions. Susceptible to secondary bacterial infections if the skin is damaged by rough netting or aggressive tankmates.