Can Discus Live With Three-Lined Pencilfish?
Discus and Three-Lined Pencilfish are NOT compatible tank mates.
Detailed Analysis
Temperature
⚠ Use Caution
Very narrow temperature overlap (82–82°F). Maintaining stable temp in this range may be difficult.
pH
✓ Compatible
Good pH overlap at 5.5–7.0.
Size
✗ Not Compatible
Extreme size difference. Discus (8") may eat or bully Three-Lined Pencilfish (1.5").
Temperament
✓ Compatible
Both fish have compatible temperaments.
Swim Level
✓ Compatible
Fish occupy different water levels (Discus: middle, Three-Lined Pencilfish: top), reducing conflict.
Important Notes
- Discus is a schooling fish and needs at least 5 of its kind.
- Three-Lined Pencilfish is a schooling fish and needs at least 6 of its kind.
Tank Requirements
Minimum tank size for this combination: 60 gallons
| Parameter | Discus | Three-Lined Pencilfish |
|---|---|---|
| Temperature | 82–88°F | 75–82°F |
| pH | 5.5–7 | 5–7 |
| Max Size | 8" | 1.5" |
| Temperament | Peaceful | Peaceful |
| Swim Level | Middle | Top |
| Min Tank | 55 gal | 10 gal |
Check More Combinations
Use our compatibility checker to add more fish and plan your complete tank.