Purple Firefish (Nemateleotris decora) Care Guide
A beautiful dartfish with a white body that transitions into rich purple and red on the fins and tail. More colorful than the standard Fire Goby. Peaceful and reef-safe but a notorious jumper.
Compiled by Aquairi from published sources · Published · Updated
Overview
Nemateleotris decora is a species in the family Ptereleotridae. A beautiful dartfish with a white body that transitions into rich purple and red on the fins and tail. More colorful than the standard Fire Goby. Peaceful and reef-safe but a notorious jumper. Best kept singly or in established pairs.
Taxonomy
- Family: Ptereleotridae
- Genus: Nemateleotris
- Scientific name: Nemateleotris decora
- Other names: Decorated Firefish, Elegant Firefish
- Origin: Indo-Pacific
Habitat
Distributed across the western and central Pacific from the Ryukyu Islands south to the Great Barrier Reef and east to the Marquesas. Hovers above rubble at the base of reef slopes at depths of 5-70 m; like its congeners, retreats into a self-excavated burrow when alarmed.
Tank requirements
- Minimum tank volume: 80 L
- Temperature: 24-27 °C
- pH: 8.1-8.4
- GH: 8-12 °dGH
- Water flow: moderate
- Adult size: 7-9 cm
- Lifespan: 3-5 years
- Difficulty: beginner
Diet
Classified as carnivore. Recommended feeding frequency: 2x daily. In captivity, offer a varied diet appropriate to the species — quality prepared foods supplemented with frozen or live items of suitable size.
Compatibility
- Temperament: peaceful
- Swimming level: middle
- Compatible tank mates: Clownfish, Royal Gramma, Blennies, Wrasses
- Avoid with: Aggressive Fish, Other Dartfish
Reef compatibility
Generally classified as reef-safe: does not feed on stony or soft corals, tridacnid clams or ornamental shrimps under normal conditions.
Breeding
- Breeding difficulty: advanced
Purple Firefish (Nemateleotris decora) Breeding Guide
Overview
Nemateleotris decora is a dartfish (family Ptereleotridae) of the Indo-Pacific from Mauritius to Samoa, north to the Ryukyu Islands and south to New Caledonia, reaching about 9 cm (FishBase). It inhabits deeper outer reef drop-offs with moderate to strong currents on sand-and-rubble bottoms, feeds on zooplankton, especially copepods and crustacean larvae, and is often found in pairs, darting into a hole when alarmed (FishBase). It is oviparous and monogamous, but its pelagic larvae make it rarely if ever bred at home.
Sexing
Reliable external sexing is not documented in the consulted sources. Adults are often found in pairs, reflecting their monogamous social structure, so a bonded pair is recognized behaviorally rather than by fixed markings (FishBase).
Breeding Setup
A calm aquarium with a sand-and-rubble bottom and rockwork providing holes suits a bonded pair. Like other firefish it is a notorious jumper, so a secure lid is essential, and stable parameters in the species range (temperature roughly 23-27 C) support condition (FishBase).
Spawning Behavior & Trigger
The species is oviparous with monogamous mating observed as both obligate and social, but detailed spawning behavior is not elaborated in the consulted scientific sources (FishBase). Dartfish of this group are not established as home-bred species.
Egg & Fry Care
Specific egg and fry data for Nemateleotris decora are not documented in the consulted sources. Gobioid reef larvae of this type are small and pelagic, requiring tiny live first foods, and no reliable home rearing protocol is published for this species.
Common Challenges
The absence of documented spawning and rearing methods, the pelagic larvae, and the species' jumping behavior make home breeding impractical. A bonded pair can be kept in a securely covered tank, but reproduction to settlement is not established.