Can Guppy live with Swordtail?
🟡 CAUTION
Case-by-case. Watch group sizes, tank size, and feeding zones.
Guppy
Poecilia reticulata
| Adult Size: | 2.0" |
| Temperament: | peaceful |
| Min Tank: | 10 gal |
| Temperature: | 72-82°F |
| pH Range: | 6.8-7.8 |
Swordtail
Xiphophorus helleri
| Adult Size: | 5.0" |
| Temperament: | semi-aggressive |
| Min Tank: | 20 gal |
| Temperature: | 72-78°F |
| pH Range: | 7.0-8.0 |
Water Parameter Overlap
| Parameter | Guppy | Swordtail | Overlap |
|---|---|---|---|
| Temperature | 72-82°F | 72-78°F | 6°F ✓ |
| pH | 6.8-7.8 | 7.0-8.0 | 0.7999999999999998 ✓ |
Why CAUTION?
Temperament Match: peaceful + semi-aggressive. Semi-aggressive → watch territory and feeding.
⚠️ Size Predation Risk: Guppy (2.0") vs Swordtail (5.0"). Large size difference → larger fish may eat smaller fish.
Score: 66.0/100 (CAUTION threshold: GOOD ≥80, CAUTION ≥50, RISKY <50).
🔧 Tank Stocking Calculator
Enter tank size to calculate safe stocking levels:
Recommended Equipment
Based on tank size 10+ gallons:
Aqueon LED MiniBow Kit — $49.99
Compact 5-gallon starter kit
Accuracy note: This tool uses expert rules + FishBase.org data. Individual fish behavior varies. Always observe, quarantine new arrivals for 2-4 weeks, and avoid overcrowding.