Siamese Fighting FishBetta splendens
Black MollyPoecilia sphenops
Verdict:not recommended
- Behaviour: not recommended
- Water: ranges overlap
Why
A Siamese fighting fish is, as a rule, kept alone: it rarely tolerates tankmates. The molly is larger (8–12 cm) and needs hard, alkaline water. The two share a hardness range, but the needs of the species differ.
Water and size
| Parameter | Siamese Fighting Fish | Black Molly | Shared range |
|---|---|---|---|
| Temperature | 22 – 28 °C (72 – 82 °F) | 21 – 26 °C (70 – 79 °F) | 22 – 26 °C (72 – 79 °F) ranges overlap |
| Water pH | 6 – 8 | 7 – 8.5 | 7 – 8 ranges overlap |
| Water dH | 5 – 19 | 15 – 30 | 15 – 19 ranges overlap |
| Size in aquarium | 7 cm (2.8 in) | 8 – 12 cm (3.1 – 4.7 in) | |
| Required aquarium volume | from 40 L (11 gal) | from 150 L (40 gal) | |
| Keeping | Solitary | Mixed (solitary / pair / group) | |
| Temperament | Territorial (often aggressive) | Peaceful (regular) | |
| Swimming level | near the surface | near the surface |
This is a general estimate: fish of the same species differ in character. Tank volume is given for each species separately — two species together need at least the larger of the two, and usually more.
Other pairs with these fish
- Siamese Fighting Fish + Goldfish not recommended
- Siamese Fighting Fish + Angelfish not recommended
- Siamese Fighting Fish + Common Guppy not recommended
- Siamese Fighting Fish + Neon Tetra with caution
- Siamese Fighting Fish + Common Platy not recommended
- Siamese Fighting Fish + Bronze Corydoras with caution
- Siamese Fighting Fish + Sumatran Barb not recommended
- Siamese Fighting Fish + Oscar Cichlid not recommended
- Goldfish + Black Molly with caution
- Angelfish + Black Molly not recommended
- Common Guppy + Black Molly compatible
- Neon Tetra + Black Molly not recommended
- Black Molly + Common Platy compatible
- Black Molly + Bronze Corydoras compatible
- Black Molly + Sumatran Barb with caution
- Black Molly + Oscar Cichlid not recommended