Can Neon Rainbowfish live with Weather Loach?
High risk due to water mismatch, aggression, or predation.
Why Neon Rainbowfish and Weather Loach Don't Make an Easy Pair
The size gap is 7.5" — Neon Rainbowfish (2.5") and Weather Loach (10.0"). A fish that fits in another fish's mouth will eventually end up there.
Neon Rainbowfish
Melanotaenia praecox
| Adult Size: | 2.5" |
| Temperament: | peaceful |
| Min Tank: | 20 gal |
| Temperature: | 75-82°F |
| pH Range: | 6.5-7.5 |
Weather Loach
Misgurnus anguillicaudatus
| Adult Size: | 10.0" |
| Temperament: | peaceful |
| Min Tank: | 30 gal |
| Temperature: | 50-77°F |
| pH Range: | 6.0-8.0 |
Water Parameter Overlap
| Parameter | Neon Rainbowfish | Weather Loach | Overlap |
|---|---|---|---|
| Temperature | 75-82°F | 50-77°F | 2°F ✓ |
| pH | 6.5-7.5 | 6.0-8.0 | 1.0 ✓ |
Compatibility Breakdown
Temperament Match: peaceful + peaceful. Both peaceful → minimal conflict.
⚠️ Size Predation Risk: Neon Rainbowfish (2.5") vs Weather Loach (10.0"). A 7.5" gap — the larger fish will view the smaller fish as food.
Score: 40.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 30 gallons — sized for the larger fish in the pair.
- Temperature: keep it between 75°F and 77°F.
- pH: maintain 6.5 – 7.5.
- Hiding spots: essential for Neon Rainbowfish — caves, plants, or driftwood to retreat when feeling stressed.
- Water changes: 25% weekly minimum. Two species mean double the bioload.
🔧 Tank Stocking Calculator
Enter tank size to calculate safe stocking levels:
Recommended Equipment
Based on tank size 30+ gallons:
Sinking wafers for loaches and bottom feeders
Explore Related Checks
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Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a peaceful individual Neon Rainbowfish may act differently from its species average. Always observe, quarantine new arrivals for 2-4 weeks, and avoid overcrowding. If a pairing says CAUTION, start with a smaller group and a lid.