Neon Dwarf Rainbow

The Neon Dwarf Rainbowfish (Melanotaenia praecox) is a small, vibrant freshwater fish prized for its iridescent blue body and striking red fins. Its shimmering colors and peaceful, active schooling behavior make it a standout in planted aquariums, nano tanks, and community setups. Hardy, easy to care for, and visually stunning, the Neon Dwarf Rainbowfish is perfect for both beginner and experienced aquarists seeking a lively centerpiece fish that adds movement and brilliance to their aquarium.

Care Sheet – Neon Dwarf Rainbowfish (Melanotaenia praecox)

Temperament

• Peaceful, social schooling fish

• Best kept in groups of 6 or more for natural behavior

Adult Size

• 2–2.5 inches

Minimum Tank Size

• 20 gallons for a small school

Water Parameters

• Temperature: 72–82°F

• pH: 6.5–7.5

• Hardness: Soft to moderately hard (5–12 dGH)

• Ammonia/Nitrite: 0 ppm

• Nitrate: <20–30 ppm

Diet

• Omnivorous

• Feed a varied diet:

  • High-quality flakes or micro-pellets

  • Frozen or live foods: brine shrimp, daphnia, bloodworms

  • Occasional spirulina or plant-based supplements

• Feed small amounts 1–2× daily

Behavior & Compatibility

• Excellent for peaceful community tanks

• Compatible with:

  • Tetras, rasboras, and barbs (non-aggressive species)

  • Corydoras and other bottom dwellers

  • Small gouramis

• Avoid aggressive or large predatory fish

Aquarium Setup

• Planted tanks enhance coloration

• Open midwater swimming space

• Gentle filtration and clean, oxygen-rich water

• Moderate lighting for best color display

Care Level

• Easy to moderate

• Hardy and beginner-friendly

Lifespan

• 3–5 years with proper care

Special Notes

• Colors intensify when kept in a healthy school with good nutrition

• Very active swimmers; provide open areas to showcase movement

• Ideal for planted community aquariums or nano setups