Overview
The Rainbowfish (Melanotaenia lacustris) is a freshwater fish from the family Melanotaeniidae. It thrives at temperatures of 22–27 °C with a pH of 7.0–8.0, requiring a minimum tank size of 150 litres. Vibrant and active schooling fish from Australian and New Guinean lakes. Colors intensify under bright light and when males display to females.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Melanotaeniidae |
| Genus | Melanotaenia |
| Species | Melanotaenia lacustris |
| Water type | freshwater |
Natural Habitat
Appearance
Behavior
Colors intensify under bright light and when males display to females
| Trait | Value |
|---|---|
| Temperament | Vibrant and active schooling fish from Australian and New Guinean lakes |
| Schooling | Yes |
| Activity level | active |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 22–27°C (72–81°F) | Use a reliable adjustable heater |
| pH | 7–8 | Avoid sudden swings |
| Hardness (GH) | medium dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <30 ppm | Manage through regular partial water changes |
| Min. tank | 150L (40 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Rainbowfish are exclusively found in Australia and New Guinea
📋 Full Care Guide
Ready to set up a tank for your Rainbowfish? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Rainbowfish Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.