Turquoise Rainbowfish

Melanotaenia lacustris

Minimum Tank Size

55+ gal

Temperature

72–82°F

PH

7.0–8.0

Adult Size

4–5 in

Temperament 

Peaceful active schooling fish

Care Difficulty

Intermediate

Diet & Feeding

Feed a varied species-appropriate diet based on a quality prepared staple, supplemented with foods suited to the species. Avoid chronic overfeeding.

Care Instructions

Maintain stable 72–82°F water and suitable chemistry. Plan the aquarium around adult size, behavior, waste production, and swimming space.

Flow & Filtration

Use mature biological filtration, good oxygenation, and flow appropriate to the species. Keep ammonia and nitrite at zero and maintain nitrate with regular water changes.

Planted Tank Suitability

Plant suitability depends on digging, grazing, adult size, and water chemistry. Use hardy or protected plants where necessary.

Tank Mate Compatibility

Good Tank Mates
  • Boesemani Rainbowfish
  • Larger Tetras
  • Corydoras

Use Caution 
  • Angelfish
  • Gourami

Avoid
  • Betta
  • Tiny Nano Fish

Compatibility Notes

Keep a group in a long tank with clean, well-oxygenated water.

Breeding Notes

Breeding requirements vary by species; use appropriate caves, spawning sites, or a dedicated breeding setup when attempting to raise fry.