Can Bichir live with Siamese Algae Eater?
These two species are usually compatible in community tanks.
Why Bichir and Siamese Algae Eater Work
These two species overlap in both temperature (75–82°F overlap) and pH (6.5-7.5 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 (semi-aggressive + peaceful) is low-conflict. In a 55+ gallon tank with adequate hiding spots, these two can coexist with minimal problems.
Bichir
Polypterus senegalus
| Adult Size: | 12.0" |
| Temperament: | semi-aggressive |
| Min Tank: | 55 gal |
| Temperature: | 75-82°F |
| pH Range: | 6.5-7.5 |
Siamese Algae Eater
Crossocheilus oblongus
| Adult Size: | 6.0" |
| Temperament: | peaceful |
| Min Tank: | 30 gal |
| Temperature: | 75-82°F |
| pH Range: | 6.5-7.5 |
Water Parameter Overlap
| Parameter | Bichir | Siamese Algae Eater | Overlap |
|---|---|---|---|
| Temperature | 75-82°F | 75-82°F | 7°F ✓ |
| pH | 6.5-7.5 | 6.5-7.5 | 1.0 ✓ |
Compatibility Breakdown
Temperament Match: semi-aggressive + peaceful. Semi-aggressive → watch territory and feeding.
⚠️ Size Predation Risk: Bichir (12.0") vs Siamese Algae Eater (6.0"). A 6.0" 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: 80.0/100 (GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Setup Requirements (for Both)
- Minimum tank: 55 gallons — sized for the larger fish in the pair.
- Temperature: keep it between 75°F and 82°F.
- pH: maintain 6.5 – 7.5.
- Hiding spots: essential for Bichir — 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 55+ gallons:
Sinking carnivore pellets for bichir
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 Bichir 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.