Can Molly Live With Ruby Tetra?
Molly and Ruby Tetra are NOT compatible tank mates.
Detailed Analysis
Temperature
✓ Compatible
Good temperature overlap at 72–82°F.
pH
⚠ Use Caution
Very narrow pH overlap (7.0–7.0). Hard to maintain precisely.
Size
✗ Not Compatible
Extreme size difference. Molly (4") may eat or bully Ruby Tetra (0.7").
Temperament
✓ Compatible
Both fish have compatible temperaments.
Swim Level
✓ Compatible
Swim level compatibility is fine.
Trait Conflict
⚠ Use Caution
Molly may prefer brackish water conditions, which Ruby Tetra cannot tolerate long-term.
Important Notes
- Ruby Tetra is a schooling fish and needs at least 8 of its kind.
Tank Requirements
Minimum tank size for this combination: 23 gallons
| Parameter | Molly | Ruby Tetra |
|---|---|---|
| Temperature | 72–82°F | 68–82°F |
| pH | 7–8.5 | 5–7 |
| Max Size | 4" | 0.7" |
| Temperament | Peaceful | Peaceful |
| Swim Level | Middle | Middle |
| Min Tank | 20 gal | 5 gal |
Check More Combinations
Use our compatibility checker to add more fish and plan your complete tank.