Dwarf Neon Rainbowfish – Brilliant Metallic Blue Freshwater Schooling Fish
The Dwarf Neon Rainbowfish (Melanotaenia praecox) is a stunning freshwater aquarium fish admired for its brilliant metallic blue body, vibrant fin coloration, and energetic schooling behaviour.
Native to the tropical freshwater systems of Papua, Indonesia, this beautiful rainbowfish features shimmering iridescent scales that reflect shades of electric blue and turquoise under aquarium lighting.
Mature males typically develop striking reddish-orange fins, while females often display attractive yellow to orange fins, creating a colourful contrast when kept together.
Unlike larger rainbowfish species, the Dwarf Neon Rainbowfish remains relatively compact, making it an excellent choice for medium-sized planted aquariums.
These peaceful, active fish thrive in groups, swimming gracefully through open areas while displaying their brilliant colours and natural social behaviour.
Hardy, colourful, and highly entertaining, the Dwarf Neon Rainbowfish is an excellent addition to peaceful tropical community aquariums.
Care Guide
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Parameter
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Details
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Scientific Name
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Melanotaenia praecox
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Common Name
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Dwarf Neon Rainbowfish
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Other Names
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Praecox Rainbowfish, Neon Dwarf Rainbowfish
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Origin
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Mamberamo River Basin, Papua, Indonesia
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Adult Size
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Approximately 5–8 cm
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Temperature
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23–28°C
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pH
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6.8–7.5
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Water Hardness
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5–15 dGH
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Minimum Tank Size
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80–100 L+ recommended for a group
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Diet
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Omnivore; flakes, micro pellets, frozen and live foods
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Temperament
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Peaceful, active
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Care Level
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Easy to Intermediate
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Group Size
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6–8 minimum; preferably 8–10+
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Lifespan
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Approximately 4–6 years
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Swimming Level
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Middle / Upper
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Water Flow
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Gentle to Moderate
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Aquarium Type
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Planted Aquarium / Community Aquarium
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Special Requirements
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Open swimming space, stable water, secure lid
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