Can Congo Tetra live with Electric Blue Crayfish?
Case-by-case. Watch group sizes, tank size, and feeding zones.
Why Congo Tetra and Electric Blue Crayfish Don't Make an Easy Pair
They can coexist, but you need to manage the setup carefully. The temperament combination (peaceful+aggressive) can work, but you will need to watch them at feeding time for the first week.
Congo Tetra
Phenacogrammus interruptus
| Adult Size: | 3.0" |
| Temperament: | peaceful |
| Min Tank: | 30 gal |
| Temperature: | 73-82°F |
| pH Range: | 6.0-7.5 |
Electric Blue Crayfish
Procambarus alleni
| Adult Size: | 6.0" |
| Temperament: | aggressive |
| Min Tank: | 30 gal |
| Temperature: | 65-80°F |
| pH Range: | 6.5-8.0 |
Water Parameter Overlap
| Parameter | Congo Tetra | Electric Blue Crayfish | Overlap |
|---|---|---|---|
| Temperature | 73-82°F | 65-80°F | 7°F ✓ |
| pH | 6.0-7.5 | 6.5-8.0 | 1.0 ✓ |
Compatibility Breakdown
Temperament Match: peaceful + aggressive. One aggressive → predation/nipping risk.
⚠️ Size Predation Risk: Congo Tetra (3.0") vs Electric Blue Crayfish (6.0"). A 3.0" gap — the larger fish will view the smaller fish as food.
Score: 75.0/100 (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 73°F and 80°F.
- pH: maintain 6.5 – 7.5.
- Hiding spots: essential for Congo Tetra — 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:
High-quality flake food for large tetras
Explore Related Checks
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Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies — a peaceful individual Congo Tetra 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.