Can Flowerhorn live with Hillstream Loach?
High risk due to water mismatch, aggression, or predation.
Why Flowerhorn and Hillstream Loach Don't Make an Easy Pair
There is no temperature overlap — Flowerhorn needs 78-86°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. The size gap is 9.5" — Flowerhorn (12.0") and Hillstream Loach (2.5"). A fish that fits in another fish's mouth will eventually end up there.
Flowerhorn
Amphilophus hybrid
| Adult Size: | 12.0" |
| Temperament: | aggressive |
| Min Tank: | 75 gal |
| Temperature: | 78-86°F |
| pH Range: | 6.5-8.0 |
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 | Flowerhorn | Hillstream Loach | Overlap |
|---|---|---|---|
| Temperature | 78-86°F | 64-75°F | No overlap ✗ |
| pH | 6.5-8.0 | 6.5-7.5 | 1.0 ✓ |
Compatibility Breakdown
Temperament Match: aggressive + peaceful. One aggressive → predation/nipping risk.
⚠️ Size Predation Risk: Flowerhorn (12.0") vs Hillstream Loach (2.5"). A 9.5" gap — the larger fish will view the smaller fish as food.
⚠️ Diet Conflict: A carnivore sharing water with a fish small enough to fit in its mouth is a waiting game. Feed generously, but the risk is structural — not something you can manage meal by meal.
Score: 5.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 75 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 Hillstream Loach — 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 75+ gallons:
Large pellet food for big cichlids like flowerhorn
Explore Related Checks
See what else works with these fish:
Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a aggressive individual Flowerhorn 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.