Purple Moon Angelfish - Pomacanthus maculosus

Purple Moon Angelfish (Pomacanthus maculosus)

The Purple Moon Angelfish (Pomacanthus maculosus) is a magnificent large marine angelfish recognised by its deep blue to violet body, brilliant yellow tail and broad yellow crescent-shaped marking across each flank. Also known as the Yellowbar Angelfish, Halfmoon Angelfish or Maculosus Angelfish, it originates from the Red Sea and north-western Indian Ocean, where adults inhabit coral and rocky reefs rich in caves, sponges and encrusting growth. Intelligent, imposing and increasingly territorial as it matures, this spectacular centrepiece fish requires an exceptionally large, established marine aquarium and experienced long-term care.

Common Name:
Purple Moon Angelfish, Yellowbar Angelfish, Yellow-Band Angelfish, Halfmoon Angelfish, Maculosus Angelfish, Yellow-Blotch Angelfish

Scientific Name (Latin):
Pomacanthus maculosus

Maximum Size:
Commonly around 30–40 cm in aquariums, with an exceptional recorded wild maximum of approximately 50 cm standard length. Permanent accommodation must be planned around a very large, deep-bodied adult.

Water Type:
Marine

Origin / Natural Habitat:
Native primarily to the Red Sea, Gulf of Aden, Persian Gulf, Gulf of Oman and adjoining areas of the north-western Indian Ocean.

It inhabits coral and rocky reefs, coastal reef faces, caves, ledges and sheltered areas at depths of approximately 4–60 metres. Adults are normally solitary or found as established pairs and remain closely associated with substantial reef structures containing sponges, tunicates and other encrusting organisms.

Water Parameters:
Temperature: 24–28°C
pH Range: 8.1–8.4
Salinity: 1.020–1.025 SG

Temperament:
Semi-aggressive, territorial and potentially dominant. Juveniles may initially appear relatively reserved, but adults commonly defend a substantial area of the aquarium and can become aggressive towards other large angelfish, similarly shaped species and newly introduced fish.

It is normally best maintained as the only large Pomacanthus angelfish unless the aquarium is exceptionally spacious and designed to provide clearly separated territories.

Diet:
An omnivorous reef grazer that naturally consumes sponges, tunicates, algae and other encrusting organisms.

In the aquarium, provide specialist marine angelfish preparations containing sponge material, together with mysis shrimp, chopped prawn, mussel, clam, squid, krill and other marine-origin foods. Spirulina-based foods, marine algae and dried seaweed should also be offered regularly.

Feed at least two or three modest meals each day. A varied diet containing sponge material, marine protein and vegetable matter is essential for healthy development, strong colour and long-term condition.

Minimum Tank Size:
A minimum aquarium volume of approximately 1,200 litres is recommended for long-term care, with a tank length of at least 200–240 cm strongly preferred.

A considerably larger aquarium is advisable when the fish is maintained with other large or territorial marine species. Aquarium length, width and open swimming area are more important than height alone.

Behaviour & Activity:
An active daytime swimmer that patrols the middle and lower areas of the aquarium, regularly inspecting rockwork and picking at sponge, algae and other encrusting growth.

Newly introduced specimens may initially remain close to caves and overhangs. Once established, the Purple Moon Angelfish usually becomes bold, highly visible and responsive at feeding time.

Juveniles display curved blue and white bands across a dark body. As the fish matures, these markings gradually change into the adult pattern of a deep blue to violet body, yellow tail and broad yellow crescent across the flanks.

Adults may produce audible grunting or knocking sounds when alarmed, displaying or defending their territory.

Reef Safe:
Reef Safe with Caution

The Purple Moon Angelfish is likely to nip large-polyp and small-polyp stony corals, soft corals, zoanthids, sponges, tunicates and clam mantles. Feather duster worms and other sessile invertebrates may also be investigated.

Although individual behaviour varies, this species should not be considered reliably compatible with a valuable mixed reef aquarium. It is best maintained in a very large fish-only or fish-only-with-live-rock system.

Special Requirements or Care Notes:
Introduce only to a mature, fully cycled marine aquarium containing extensive established rockwork, natural grazing surfaces and several caves large enough to accommodate a fully grown adult.

Powerful biological filtration, efficient protein skimming, strong circulation and excellent oxygenation are essential. Large angelfish feed heavily, produce considerable waste and respond poorly to unstable or deteriorating water quality.

Offer several meals throughout the day rather than relying on one large feeding. Natural sponge, algae and biofilm growing on mature live rock can help newly introduced specimens settle and begin feeding confidently.

This species can become increasingly territorial with age. Avoid keeping it with other large Pomacanthus angelfish unless the aquarium is exceptionally spacious. It should normally be introduced after peaceful fish but before extremely aggressive tank mates.

A carefully managed quarantine period is strongly recommended, as marine angelfish can be vulnerable to white spot, velvet, flukes and other external parasites following collection and transport.

Select an alert specimen with clear eyes, intact fins, normal respiration and a rounded body profile. Avoid individuals with a pinched abdomen, cloudy eyes, damaged mouths or persistent refusal of food.

The cheek carries a strong preopercular spine that can become trapped in conventional aquarium nets. A suitably sized rigid submerged container is preferable when transferring the fish.

Suitable for:
Intermediate fishkeepers

Availability:
Occasional in trade

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.