Royal angelfish (Pygoplites diacanthus) care guide

Group
Marine fish
Other names
Regal angelfish
Family
Pomacanthidae (marine angelfishes)
Origin
Tropical Indo-Pacific, Red Sea and East Africa to the Tuamotus and Great Barrier Reef; coral-rich lagoons and reefs near caves, 0–80 m
Water
saltwater
Maximum size
25 cm
Temperature
24–27°C
pH
8.1–8.4
Hardness
Salinity SG 1.023–1.026
Minimum tank
600 litres
Care level
expert
Temperament
semi_aggressive
Reef safe
no
Lifespan
Up to about 15 years years

Care

Needs a mature, well-furnished tank with caves and crevices. The minimum tank size of about 600 litres is our own estimate from the adult size and habits, not a figure from the sources. No species-specific water figures are given in the sources, so the values here are general marine aquarium guidance rather than figures for this fish: 24–27 °C, pH 8.1–8.4 and a specific gravity of 1.023–1.026. Keep conditions stable, with low nitrate and good oxygenation. Lives alone, in pairs or in small groups. Juveniles shelter in cracks and crevices. Can be shy and stressed by boisterous tankmates. Orange-yellow with white-edged blue bars, a dark blue rear dorsal fin with blue spots and a yellow tail. Juveniles have a dark eyespot on the rear dorsal fin. A minor aquarium fish that is hard to keep. The article gives no IUCN category. Sources: Wikipedia, List of marine aquarium fish species (en.wikipedia.org/wiki/Listofmarineaquariumfishspecies); Wikipedia (en.wikipedia.org/wiki/Pygoplitesdiacanthus). Checked October 2026.

Diet

Mainly sponges and tunicates. Often difficult to feed; offer angelfish foods with sponge, frozen mysis, chopped seafood and marine algae several times a day, and keep it in a mature tank with plenty of live rock.

Breeding

Marine angelfish are pelagic broadcast spawners: a pair rises into the water column, usually around dusk, and releases eggs and sperm together. Spawns at dusk or at night after a spiralling courtship. Not bred in home aquaria.

Compatibility and tank mates

The list marks it as not reef safe, though the Wikipedia article says it is valued as one of the safer angelfish because it does not usually eat corals; it will still graze sponges and tunicates. Avoid large angelfish, triggerfish, puffers and aggressive clownfish and surgeonfish as tankmates.

Last updated 8 October 2026. Community-edited care guide on Aquatic-Auctions.

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