Bettas and Mollies, side by side
| Betta | Molly | |
|---|---|---|
| Adult size | 2.6 in6.5 cm | 3.9 in10 cm |
| Smallest tank | 5 gal19 L | 30 gal114 L |
| Keep | One | 3 or more |
| Temperature | 75–82 °F24–28 °C | 73–82 °F23–28 °C |
| pH | 6–7.8 | 7.5–8.5 |
| Temperament | Semi-aggressive | Peaceful |
| Swims | Near the top | In the middle |
Why it does not work
They need different water: Betta likes a pH of 6–7.8, molly likes 7.5–8.5.
Better tank mates for bettas
Better tank mates for mollies
Questions and answers
Can bettas and mollies live in the same tank?
No, not a good match. They need different water: Betta likes a pH of 6–7.8, molly likes 7.5–8.5.
What temperature suits bettas and mollies?
75–82 °F (24–28 °C) suits both.
More pairs
- Bettas and guppies
- Bettas and neon tetras
- Bettas and fancy goldfish
- Bettas and angelfish
- Bettas and bronze corydoras
- Mollies and platies
- Mollies and tiger barbs
- Mollies and dwarf gouramis
- Mollies and cherry shrimp
- All pairs
Based on each species' adult size, water range and temperament (Seriously Fish, FishBase) and the rules of our stocking calculator. Individual fish differ: this is a guide, not a guarantee.