Rainbow Fish 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.
Quick fact: Melanotaenia lacustris belongs to the family Melanotaeniidae. Care level: beginner.
Rainbow Fish Scientific Classification
| Rank | Classification |
|---|---|
| Family | Melanotaeniidae |
| Genus | Melanotaenia |
| Species | Melanotaenia lacustris |
| Water type | freshwater |
Rainbow Fish Natural Habitat
Rainbow Fish Appearance & Size
Rainbow Fish Behavior & Temperament
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 |
Rainbow Fish 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 |
Important: Always dechlorinate tap water before adding it to the tank. Chlorine and chloramines damage a fish's gills and reduce life expectancy.
Interesting Facts About Rainbow Fish
- Rainbowfish are exclusively found in Australia and New Guinea
Species Related to Rainbow Fish
Related Species & Guides
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Editorial review
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.