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Melanotaenia praecox
A small rainbowfish shining in neon blue. Male morning flashing display is spectacular.
The neon dwarf rainbowfish (Melanotaenia praecox) is endemic to the Mamberamo River system in West Papua (New Guinea). At 5–7 cm, it is among the smaller rainbowfishes, yet males dazzle with electric neon-blue body coloration and vivid red-to-orange fins — a combination that glows brilliantly under aquarium lighting and creates stunning visual impact in planted tanks. Females are silver-green with orange fin edging. Among the most popular rainbowfishes in the hobby due to their compact size, brilliant color, and relative ease of care, neon dwarf rainbows thrive in slightly alkaline to neutral water (pH 7.0–8.0) at 24–28°C. Keeping six or more fish encourages active 'morning flashing' displays in which competing males light up with maximum color intensity. Peaceful and community-compatible, they accept a varied omnivorous diet of quality granules, flake food, frozen bloodworms, and brine shrimp. Breeding on fine-leaved plants or wool spawning mops in slightly hard, neutral water is achievable for intermediate aquarists.
Origin
Mamberamo River system, West Papua, New Guinea
Lifespan
3-5 years
Size
5-7cm
Temperature
22〜28℃
Pellets, Frozen food
Slightly alkaline (pH 7.0-8.0)
Sources: FishBase / Seriously Fish
Edited & verified by: br-choku editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Sources: FishBase / Seriously Fish / CITES Appendices (Checklist)
Regulations may change. Always verify the latest information with the relevant authorities.
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Maintain 24-28°C
Blue shimmer stands out in schools
Males flash in morning light
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Neon Dwarf Rainbowfish is 22〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Neon Dwarf Rainbowfish is 3-5 years. With proper care and nutrition, they can live a long and healthy life.
Neon Dwarf Rainbowfish typically reaches 5-7cm as an adult. Size may vary depending on care conditions and individual genetics.
Neon Dwarf Rainbowfish feeds on: Pellets, Frozen food. Aim for a balanced diet with appropriate feeding frequency.
The price of Neon Dwarf Rainbowfish varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 23, 2026