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.