Regal Angel

Overview

The Regal Angel (Pygoplites diacanthus) — also called the Royal Angelfish — is, for many reefers, the most beautiful angel in the sea: a body of alternating orange and blue-edged white bars, a striped blue-and-orange dorsal, and impossibly clean colour. It's the sole member of its genus, found from the Red Sea across the Indian Ocean and Indo-Pacific, always close to reef caves and crevices.

As stunning as it is, we won't sugar-coat it: this is one of the more difficult marine fish in the hobby. Regals are shy, reclusive, delicate and notoriously reluctant to feed, and their track record in home aquariums is mixed at best.

Success hinges on selection. Red Sea (yellow-belly) specimens have a strong reputation for adapting far better than Indo-Pacific fish — largely thanks to superior collection and handling — and captive-bred Regals, raised on prepared foods, are better still. Whichever you choose, only take home a good-sized, alert fish you've watched eating. We rate it advanced, and mean it.

Compatibility

Despite its size, the Regal is a shy, peaceable fish rather than a bully — it's cryptic by nature, never straying far from a crevice, and can actually be picked on by other large angels. Introduce it first when stocking a large-fish system so it can settle and claim a territory before more assertive tankmates arrive, and pair it with calm, non-aggressive company.

Wild Regals live singly, in pairs, or in small harems of a male with a few females, but in the aquarium it's safest kept as the only Regal — and the only large angel — unless you have a very large system and real experience. Its shyness means boisterous or dominant tankmates will keep it hiding, where a delicate, reluctant feeder quickly declines.

Health & quarantine

This is where the Regal earns its reputation. It's delicate, sensitive to water quality, and famously reluctant to eat — and the acclimation period is the make-or-break window. Buy smart: a Red Sea yellow-belly or captive-bred fish, good-sized (avoid tiny specimens, which have almost no fat reserve and rarely survive), alert, unblemished, and — most importantly — already feeding, ideally observed in-store over several minutes. Give it a low-stress quarantine, dim lighting at first, a very slow acclimation, and pristine, stable water in a mature system. Angels are also prone to ich, so a proper quarantine protects both the Regal and your other fish. Get one settled and eating and it can live many years; rush it and it may simply waste away.