Blue Rainbowfish (Melanotaenia lacustris)

The Blue Rainbowfish (Melanotaenia lacustris) is a striking freshwater species admired for its shimmering blue coloration and lively swimming behavior. Native to Lake Kutubu in Papua New Guinea, this species is highly sought after for community aquariums due to its peaceful temperament, schooling nature, and vibrant appearance.

With proper care, Blue Rainbowfish can grow to an average size of 10–12 cm and live up to 5–8 years, making them a rewarding addition for both beginner and experienced aquarists. Their active schooling behavior adds constant movement and brilliance to aquascapes.

Care Guidelines:

• Tank Size: A minimum of 30 gallons is recommended, with larger aquariums preferred for groups.

• Water Parameters: Maintain a temperature of 24–28°C, pH between 6.5–7.5, and moderate water hardness.

• Diet: Omnivorous; thrives on a varied diet of high-quality flakes, pellets, live, and frozen foods such as brine shrimp and bloodworms.

• Behavior: Peaceful schooling species; best kept in groups of six or more to encourage natural activity and coloration.

• Tank Setup: Provide open swimming space along with planted areas and driftwood for a natural environment. Moderate water flow is beneficial.

Tips for Success:

• Keep Blue Rainbowfish in groups to minimize stress and display their best colors.

• Regular water changes and stable water conditions are essential for maintaining health.

• Pair with other peaceful community fish such as tetras, rasboras, and corydoras.

The Blue Rainbowfish is an excellent choice for aquarists seeking a hardy, vibrant species that enhances both the beauty and liveliness of freshwater aquariums.