Can Bala Shark live with Jack Dempsey?
These two species are usually compatible in community tanks.
Why Bala Shark and Jack Dempsey Work
These two species overlap in both temperature (72–82°F overlap) and pH (6.5-8.0 overlap range). Their temperature tolerances are close enough, and neither fish pushes the pH so far outside the other's comfort zone that it creates chronic stress. The temperament match (peaceful + aggressive) is low-conflict. In a 150+ gallon tank with adequate hiding spots, these two can coexist with minimal problems.
Bala Shark
Balantiocheilos melanopterus
| Adult Size: | 14.0" |
| Temperament: | peaceful |
| Min Tank: | 150 gal |
| Temperature: | 72-84°F |
| pH Range: | 6.0-8.0 |
Jack Dempsey
Rocio octofasciata
| Adult Size: | 10.0" |
| Temperament: | aggressive |
| Min Tank: | 55 gal |
| Temperature: | 72-82°F |
| pH Range: | 6.5-8.0 |
Water Parameter Overlap
| Parameter | Bala Shark | Jack Dempsey | Overlap |
|---|---|---|---|
| Temperature | 72-84°F | 72-82°F | 10°F ✓ |
| pH | 6.0-8.0 | 6.5-8.0 | 1.5 ✓ |
Compatibility Breakdown
Temperament Match: peaceful + aggressive. One aggressive → predation/nipping risk.
⚠️ Size Predation Risk: Bala Shark (14.0") vs Jack Dempsey (10.0"). A 4.0" 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: 115.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 150 gallons — sized for the larger fish in the pair.
- Temperature: keep it between 72°F and 82°F.
- pH: maintain 6.5 – 8.0.
- Hiding spots: essential for Bala Shark — 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 150+ gallons:
Large pellet food for big freshwater fish
Explore Related Checks
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Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a peaceful individual Bala Shark 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.