Why won't my newly purchased Regal Angelfish eat?

This species is notoriously difficult to wean onto captive diets due to its highly specialised natural diet of sponges and tunicates. Try offering fresh, open half-shell clams or live foods to stimulate their feeding response in a quiet, stress-free environment.

Is the Regal Angelfish safe for a reef tank?

They are considered 'reef safe with caution'. While they generally leave small-polyp stony (SPS) corals alone, they are very likely to nip at large-polyp stony (LPS) corals, zoanthids, and the fleshy mantles of Tridacna clams.

What is the difference between Red Sea and Pacific Regal Angelfish?

The most obvious visual difference is the colour of the chest or 'belly'. Red Sea and Indian Ocean specimens have a bright yellow chest, whereas Pacific specimens have a grey or blue-grey chest. The Red Sea variant is also widely reputed to be hardier in captivity.

How large a tank do I need for a Regal Angelfish?

A minimum aquarium volume of 450 litres is strictly recommended. They require significant swimming space combined with vast amounts of mature live rock for grazing and hiding.

Can I keep two Regal Angelfish together?

Unless they are a confirmed, bonded male-female pair, it is strongly advised against. Keeping two together in a standard aquarium will almost certainly result in severe territorial aggression and death.

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Regal Angelfish

Pygoplites diacanthus

A breathtaking but highly demanding marine species, the Regal Angelfish requires pristine water and expert care to thrive in captivity.

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Ideal Conditions

Temperature: 24 – 28 °C
pH range: 8.1 – 8.4
Hardness: 8 – 12 dGH
Salinity: 1.02 – 1.026 SG
Adult size: 20 – 25 cm
Adult minimum: 450 litres+
Lifespan: 10 – 15 years
Diet: Omnivore, with a strong requirement for sponges and meaty foods.
Water flow: Moderate to strong
Preferred setup: Mature marine aquarium with extensive live rock formations creating caves, overhangs, and ample grazing surfaces.

About the Regal Angelfish

The Regal Angelfish (*Pygoplites diacanthus*) is widely regarded as one of the most magnificent fish available to the marine aquarist. As the sole member of its genus, it displays a completely unique pattern of vertical bands in brilliant yellow, white, and dark blue. Despite its beauty, it is notoriously challenging to keep, demanding an impeccably maintained environment and possessing a very poor track record for adapting to captive diets. It is a jewel strictly reserved for the advanced reef keeper.

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Is it right for your tank?

Check Regal Angelfish against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Regal Angelfish comes from

Native range

Indo-Pacific, Red Sea, Indian Ocean

Countries / regions

Egypt, Maldives, Indonesia, Australia, Fiji

Habitat

Coral-rich areas of lagoons and seaward reefs, heavily favouring caves and crevices.

Populations in the Red Sea and Indian Ocean feature a distinct yellow chest, while those in the Pacific have grey or blue-grey chests.

Similar species

Emperor Angelfish
Pomacanthus imperator
Majestic Angelfish
Pomacanthus navarchus
Flame Angelfish
Centropyge loricula

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Ocellaris Clownfish
Amphiprion ocellaris
Peaceful, occupies a different territorial niche, and generally ignores the angelfish.
Great
Fairy Wrasses
Cirrhilabrus spp.
Active but peaceful companions that will not aggressively outcompete the Regal Angelfish for food.
Great
Yellow Tang
Zebrasoma flavescens
Can be boisterous and outcompete the slower-feeding angelfish; must be added after the angelfish is fully established.
Compatible with caution
Large-Polyp Stony (LPS) Corals
Regal Angelfish have a high propensity for nipping at the fleshy polyps of LPS corals and the mantles of Tridacna clams.
Compatible with caution
Emperor Angelfish
Pomacanthus imperator
Mixing large marine angelfish in the same aquarium usually results in severe territorial aggression and stress.
Not recommended

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