Overview
The Eastern Rainbowfish (Melanotaenia splendida) is a freshwater fish belonging to the family Melanotaeniidae. It thrives at temperatures of 22–28 °C with a pH of 7.0–8.5, and requires a minimum tank volume of 150 litres. Known for its peaceful, active community fish, it is considered a beginner-level species. Males display intense colour and fin-spreading to rival males; females are less colourful. Water changes of 25–30 % weekly, stable parameters, and appropriate tank mates are key to long-term success with this species.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Melanotaeniidae |
| Genus | Melanotaenia |
| Species | Melanotaenia splendida |
| Water type | freshwater |
Natural Habitat
Melanotaenia splendida originates from tropical waters. It inhabits freshwater environments and is adapted to the water conditions found in its native range.
Appearance
Adults reach 10–12 cm in length. The body is freshwater and the species displays characteristic coloration suited to its environment.
Behavior
This species is described as a peaceful, active community fish. It naturally schools and should be kept in groups of 6 or more. Activity level is high. Males display intense colour and fin-spreading to rival males; females are less colourful.
| Trait | Value |
|---|---|
| Temperament | peaceful, active community fish |
| Schooling | Yes |
| Activity level | high |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 22–28°C (72–82°F) | Use a reliable adjustable heater |
| pH | 7–8.5 | Avoid sudden swings |
| Hardness (GH) | 5–25 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 150L (40 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Eastern Rainbowfish colour varies greatly by locale; fish from different rivers may look like separate species.
- Active surface swimmer and jumper — a tight-fitting lid is essential.
- Native to eastern Australia and parts of New Guinea.
📋 Full Care Guide
Ready to set up a tank for your Eastern Rainbowfish? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Eastern 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.