Praecox Dwarf Neon Rainbowfish (Melanotaenia praecox)

Praecox Rainbow (Melanotaenia praecox), also known as the Dwarf Neon Rainbowfish, is a small, vibrant freshwater fish prized for its shimmering colors and peaceful temperament.

Quick Profile

• Common Name: Dwarf Neon Rainbowfish
• Scientific Name: Melanotaenia praecox
• Size: Around 3 cm (can grow up to 5–6 cm as adults)
• Origin: New Guinea

Appearance

• Coloration: Iridescent blue-silver body with striking red or orange fins (depending on sex and diet)
• Sexual Dimorphism: Males are more colorful and have more elongated fins; females are slightly smaller and rounder

Behavior and Care

• Temperament: Peaceful, active, and social
• Schooling: Best kept in groups of 6 or more
• Tank Size: Minimum 20 gallons for a small school
• Water Parameters:
  • Temperature: 24–28°C (75–82°F)
  • pH: 6.5–7.5
  • Soft to moderately hard water
• Diet: Omnivorous—enjoys flakes, micro pellets, and live/frozen foods like daphnia or brine shrimp

Breeding

• Egg scatterers; breeding is relatively easy in a well-planted tank
• Males display vibrant colors during courtship
• Eggs hatch in about 7–10 days