Turquoise Rainbowfish (Melanotaenia lacustris) TR 1.5”+

Note: no gender requests, when two or more are ordered will try best to provide even number of each gender, but cannot guarantee. 

The Turquoise Rainbowfish is one of the most stunning and sought-after rainbowfish species available. Native to Lake Kutubu in Papua New Guinea, these fish display brilliant shades of turquoise, blue, and emerald green that intensify as they mature. Males develop deeper coloration, taller bodies, and extended finnage, making them a true centerpiece in any aquarium.

Peaceful, active, and constantly on the move, Turquoise Rainbowfish thrive in groups and add both color and energy to community aquariums. Their shimmering scales reflect light beautifully, creating an ever-changing display of metallic blues and greens.

Care Requirements

• Scientific Name: Melanotaenia lacustris
• Common Name: Turquoise Rainbowfish
• Adult Size: 4–5 inches
• Temperament: Peaceful
• Minimum Tank Size: 55 gallons
• Temperature: 72–82°F
• pH: 7.0–8.0
• Diet: Omnivore; accepts quality flakes, pellets, frozen, and live foods
• Lifespan: 5–8 years

Why You’ll Love Them
✔ Brilliant turquoise and emerald coloration
✔ Active, entertaining schooling behavior
✔ Excellent centerpiece fish for larger aquariums
✔ Peaceful and community-friendly
✔ Colors intensify with age and proper nutrition

Recommended Group Size
Rainbowfish are social fish and should be kept in groups of at least six individuals. Larger groups encourage natural behavior and help bring out the best coloration, especially in mature males.

Fish are healthy, well-acclimated, and carefully packed for safe arrival. Coloration may vary based on age, sex, and aquarium conditions, with mature males displaying the most intense colors.