Species Profile
Species Library

Dwarf Neon Rainbowfish

Accuracy: Verified
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This profile has completed research review. Source-backed care information is shown below. Final publication checks are still pending.
Species profile

Dwarf Neon Rainbowfish

Melanotaenia praecox
Peaceful Easy care 120 L minimum aquarium 5–6 cm adult size Top mid Minimum group: 8

About this species

General notes for hobby use.

Active shoaling rainbowfish needing open swimming length despite its 'dwarf' name. Best kept in a mixed-sex group.

Water parameters

Suggested general range for long-term care.

Temperature 22–28 °C
pH 6–8
GH Not yet documented
KH Up to 15 dKH
Flow preference Moderate
Data confidence Verified

Behaviour

General behaviour traits used by TanksConnected compatibility checks.

Minimum group size Minimum group: 8
Tank zone Top mid
Territory level None
Predation risk Tiny fry
Bioload factor 0.9
Peaceful but energetic. Maintain a group and leave a clear swimming lane above/among planted cover.

Compatibility flags

Quick cautions for common tank-planning issues.

Fin nipper No
Plant safe Yes
Shrimp safe Yes
Snail safe Yes
Cave breeder No
Digs substrate No
Jump risk Yes

Natural history & care

Research-backed context for long-term aquarium care.

Lifespan Not yet documented
Diet type Omnivore
Minimum aquarium volume 120 L
Minimum footprint 100 × 40 cm
Accepted scientific name Melanotaenia praecox
Alternative names Dwarf Neon Rainbowfish, Praecox Rainbowfish, Neon Rainbowfish
Native range
Northern New Guinea, especially the Mamberamo River basin.
Natural habitat
Clear tropical streams and tributaries with aquatic vegetation and good oxygenation.
Diet & feeding
Opportunistic omnivore taking insects, small crustaceans and plant/algai material; feed varied prepared and frozen foods.

Breeding & sexing

Research-backed guidance for identifying sexes and reproductive behaviour.

Sexing
Males are more strongly coloured and deeper-bodied; mature females are usually slightly smaller and rounder.
Breeding
Continuous egg scatterer; adhesive eggs are deposited among fine plants or spawning mops over several days.