Overview
The Turquoise Rainbowfish (Melanotaenia lacustris) is a intermediate freshwater species known for its turquoise blue coloration. Lake Kutubu endemic. Mid to Top.
Origin & Appearance
Origin: Papua New Guinea.
Colors: Turquoise Blue.
Body Shape: Deep Fusiform (oval/robust). Typical adult dimensions: 12.0 x 2.4 x 4.8.
Sexual Dimorphism: Strong; males more vivid colors and larger fins.
Tank & Water Requirements
| Min Tank Size | 40 gallons |
| Temperature | 72–77°F |
| pH Range | 7–8 |
| Water Hardness (GH) | 8-15 |
| Bioload | medium |
| Oxygen Demand | medium |
| Plant Safe | yes |
| Aquarium Position | Mid to Top |
Behavior & Activity
Active mid-to-upper schooler; typical rainbowfish display behavior; needs open water for speed runs
Speed: 55/100Aggression: 2/10diurnalSchooling (6+)
Breeding
Moderate; egg scatterer among mops/plants
Common Diseases
💊 Ich
Expert Notes
Lake Kutubu endemic