Can Dwarf Pencilfish Live With Jack Dempsey?
Dwarf Pencilfish and Jack Dempsey are NOT compatible tank mates.
Detailed Analysis
Temperature
✓ Compatible
Good temperature overlap at 75–82°F.
pH
✓ Compatible
Good pH overlap at 6.5–7.0.
Size
✗ Not Compatible
Extreme size difference. Jack Dempsey (10") may eat or bully Dwarf Pencilfish (1.2").
Temperament
✗ Not Compatible
Dwarf Pencilfish (peaceful) is not compatible with Jack Dempsey (aggressive). Aggression or stress is very likely.
Swim Level
⚠ Use Caution
Both fish occupy the middle level and Jack Dempsey is territorial. Provide plenty of space and hiding spots.
Trait Conflict
✗ Not Compatible
Jack Dempsey is a predator and may eat Dwarf Pencilfish.
Important Notes
- Dwarf Pencilfish is a schooling fish and needs at least 6 of its kind.
Tank Requirements
Minimum tank size for this combination: 55 gallons
| Parameter | Dwarf Pencilfish | Jack Dempsey |
|---|---|---|
| Temperature | 75–82°F | 72–86°F |
| pH | 5–7 | 6.5–7.5 |
| Max Size | 1.2" | 10" |
| Temperament | Peaceful | Aggressive |
| Swim Level | Middle | Middle |
| Min Tank | 10 gal | 55 gal |
Check More Combinations
Use our compatibility checker to add more fish and plan your complete tank.