Can Betta Fish live with Hillstream Loach?
High risk due to water mismatch, aggression, or predation.
Why Betta Fish and Hillstream Loach Don't Make an Easy Pair
There is no temperature overlap — Betta Fish needs 75-80°F while Hillstream Loach needs 64-75°F. One of them will be outside its safe range constantly, which leads to chronic stress and disease.
Betta Fish
Betta splendens
| Adult Size: | 2.8" |
| Temperament: | semi-aggressive |
| Min Tank: | 5 gal |
| Temperature: | 75-80°F |
| pH Range: | 6.5-7.5 |
Hillstream Loach
Sewellia lineolata
| Adult Size: | 2.5" |
| Temperament: | peaceful |
| Min Tank: | 20 gal |
| Temperature: | 64-75°F |
| pH Range: | 6.5-7.5 |
Water Parameter Overlap
| Parameter | Betta Fish | Hillstream Loach | Overlap |
|---|---|---|---|
| Temperature | 75-80°F | 64-75°F | No overlap ✗ |
| pH | 6.5-7.5 | 6.5-7.5 | 1.0 ✓ |
Compatibility Breakdown
Temperament Match: semi-aggressive + peaceful. Semi-aggressive → watch territory and feeding.
Score: 40.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 20 gallons — sized for the larger fish in the pair.
- Temperature: no safe overlap range exists. A heater is not enough to fix this pairing.
- pH: maintain 6.5 – 7.5.
- Hiding spots: essential for Betta Fish — 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 20+ gallons:
Algae wafers for herbivorous bottom feeders
Explore Related Checks
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Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a semi-aggressive individual Betta Fish 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.