Neon Damselfish (Pomacentrus coelestis) Care Guide
Pomacentrus coelestis is an Indo-Pacific reef damselfish reaching about 9 cm, feeding on zooplankton and benthic algae.
Compiled by Aquairi from published sources · Published · Updated
Overview
Pomacentrus coelestis, the neon damselfish, is a marine damselfish of the family Pomacentridae. FishBase records a maximum size of 9.0 cm total length. It is a widespread reef-associated species of the Indo-Pacific.
Taxonomy
- Family: Pomacentridae
- Genus: Pomacentrus
- Scientific name: Pomacentrus coelestis
Habitat
FishBase reports the species from the eastern Indian Ocean and western central Pacific: Sri Lanka to the Line and Tuamotu islands, north to southern Japan and south to the Rowley Shoals and Lord Howe Island. It lives at depths of 1–20 m, where adults inhabit lagoon and seaward reefs close to the bottom among rubble beds; juveniles school among soft corals.
Tank requirements
- Minimum tank volume: 150 L (about 40 gal)
- Temperature: 24–26 °C (75–79 °F)
- pH: 8.1–8.4
- GH: 8–12 °dGH
- Lifespan: 5–10 years
Diet
According to FishBase the neon damselfish feeds on zooplankton and benthic algae. In aquaria it accepts prepared, frozen and small live foods together with algae-based feeds.
Compatibility
This is an aggressive, mid-water Pomacentrus. FishBase notes that adults form small groups or large congregations over favourable reef sections. In aquaria it is best housed with robust tankmates such as tangs, wrasses and (with caution) triggers; slow, shy fish and additional damsels in small tanks should be avoided.
Breeding
Reproduction is oviparous with distinct pairing. FishBase reports that the eggs are demersal and adhere to the substrate and that males guard and aerate them. Captive breeding is considered an expert-level undertaking.
Conservation status
IUCN Red List: Least Concern (assessed 23 September 2021, per FishBase).
Neon Damsel (Pomacentrus coelestis) Breeding Guide
Overview
Pomacentrus coelestis Jordan & Starks, 1901, the neon damselfish, ranges widely across the Eastern Indian Ocean and Western Central Pacific, from Sri Lanka to the Line and Tuamotu Islands, and grows to about 9 cm total length. FishBase records it as oviparous with distinct pairing during breeding, following the family's demersal-spawning, male-guarded pattern.
Sexing
No reliable sexing method is documented for P. coelestis in the consulted sources, and the species shows little external dimorphism. As in related damselfishes, the nest-tending male is identified behaviourally during reproduction rather than by colour or finnage.
Conditioning
A species-specific conditioning regimen is not documented. P. coelestis is planktivorous, feeding on zooplankton and benthic algae (trophic level about 3.2); a varied diet rich in marine zooplankton substitutes supports condition. Maintain stable reef parameters within the species' recorded ranges (temperature about 24–26 °C, pH 8.1–8.4). The species is notably hardy.
Breeding Setup
Adults inhabit lagoon and seaward reefs close to the bottom among rubble beds, so a system with open rock or rubble offers a male a defensible nesting surface. The family pattern has the male clear an area of algae and invertebrates to form the nest. Because the species is aggressive, generous space and broken sightlines reduce conflict.
Spawning Behavior & Trigger
Specific spawning triggers for P. coelestis are not documented. Across Pomacentridae, ritualised courtship precedes spawning, after which the female lays a string of sticky eggs attached to the substrate and the male fertilises them externally. FishBase confirms the eggs are demersal and adhere to the substrate and that males guard and aerate them.
Egg & Fry Care
The male tends the clutch, guarding and aerating it through incubation. At family level, eggs hatch over about two to seven days into transparent larvae roughly 2–4 mm long that enter a pelagic phase. This planktonic stage is the principal obstacle to home reproduction.