Midnight Angelfish (Centropyge nox)

Midnight Angelfish Centropyge nox
Name	Midnight Angelfish
Name Lat.	Centropyge nox
Family	Angelfishes
Family lat.	Pomacanthidae
Order	Surgeonfishes
Order lat.	Acanthuriformes
Origin	Western Pacific
Habitat	Seaward reefs
Diet	Omnivore
pH	8.1-8.4
Hardness	8-10 °KH
Behavior	Semi-aggressive
Keeping	Individual, pair, harem
Reef Compatible	With caution
Care Level	Moderate
Life Span	5-10 years
Protection	No
Metric Units
Size	9 cm
Temperature	22-27 °C
Salinity	33-36 ‰
Aquarium	~ 300 l
US Units
Size	4"
Temperature	72-81 °F
Salinity	1.020-1.025 sg
Aquarium	~ 80 gal

Distribution and habitat

The distribution range of Centropyge nox is the western Pacific, from the Ryukyu Islands through Indonesia and Micronesia to the Great Barrier Reef, where they prefer to live on coral-rich outer reef slopes and occasionally in lagoons down to 70 m depth.

Maintenance

They need a well-structured aquarium with a reef structure that offers hiding, resting and covering possibilities, with living stones that they can graze on (sponges, algae, small crustaceans) and that act like a biological filter as well as sufficient swimming space. Only lime-rich, heavy metal-free sands, gravel or stones may be used as substrate.

Filters, skimmers and heaters are necessary to ensure water quality, as well as pumps to simulate tides, swells and bottom currents. Lighting must be appropriate for the species' day-night rhythm

Salinity: 33-36 ‰	pH value: 8.1-8.4
Carbonate hardness: 8-10 °KH	Nitrate content: 2-8 mg/l
phosphate content: 0.01-0.1 mg/l	nitrite content: 0.0-0.05 mg/l

For salinity, an average value should be aimed for, which may only vary slightly by +/- 0.5 ‰. Ammonia and ammonium must not be measurable. Special attention must be paid to constantly good water quality.

Diet

In nature, they feed mainly on algae and crustaceans. The change of feed does not always succeed without problems. The food supply should consist of a commercially available, vitamin-enriched frozen special food mix for angelfish or a combination of algae (e.g. spirulina, nori), chopped shrimp, crab and mussel meat with live and frozen food, such as mysis, krill, bosmids and artemia, as well as live cyclops, which also serve to keep them busy. It is recommended to feed small portions several times a day (3-5 times)

Regular and varied feeding promotes health and increases resistance.

Behaviour and compatibility

It is recommended to keep them in pairs or in a harem, one male with 2-3 females. To avoid ranking fights, they should be placed in the aquarium at the same time, with one of the animals being significantly larger. The dominant, larger animal always develops into the male. They are territorial and can sometimes be aggressive towards other dwarf angelfish with similar coloration or body shape.

Sex dimorphism

They are protogynous hermaphrodites, i.e. most males develop from functional females. External sexual characteristics are not known.

Reproduction and breeding

Breeding in the aquarium has already succeeded sporadically.

Important

As reef dwellers, they should not be kept in a fish-only aquarium. If kept in pairs, with sufficient activity (live stones) and varied feeding, they can be maintained even in demanding coral tanks, without any attacks on the corals

If different species are kept together, care should be taken to ensure that the fish match each other in terms of water quality and temperature requirements and social behavior, and that the setup meets the needs of all species kept together. New fish to be introduced must be acclimated slowly to the water in the aquarium

Further literature can be found in your pet store.

References

Text: Werner Knapp; Image: Franz Lowak

Source: KUITER, DEBELIUS (2007): Atlas der Meeresfische: Die Fische an den Küsten der Weltmeere, Kosmos Verlag; ENGELMANN (2005): Zootierhaltung - Tiere in menschlicher Obhut: Fische, Verlag Harri Deutsch; PATZNER & MOOSLEITNER (1999): Meerwasser Atlas Bd. 6, Mergus Verlag

• Gemäß § 21 Abs. 5 Tierschutzgesetz idgF