GoldfishCarassius auratus
Black MollyPoecilia sphenops
Verdict:with caution
- Behaviour: with caution
- Water: the shared range is very narrow
Why
The shared temperature is only one degree, 21–22 °C: a goldfish needs cool water, while a molly needs warm water. Hardness and pH ranges match, so caution is needed because of the temperature.
Water and size
| Parameter | Goldfish | Black Molly | Shared range |
|---|---|---|---|
| Temperature | 18 – 22 °C (64 – 72 °F) | 21 – 26 °C (70 – 79 °F) | 21 – 22 °C (70 – 72 °F) the shared range is very narrow |
| Water pH | 6 – 8 | 7 – 8.5 | 7 – 8 ranges overlap |
| Water dH | 5 – 19 | 15 – 30 | 15 – 19 ranges overlap |
| Size in aquarium | 10 – 30 cm (3.9 – 12 in) | 8 – 12 cm (3.1 – 4.7 in) | |
| Required aquarium volume | from 300 L (79 gal) | from 150 L (40 gal) | |
| Keeping | Schooling (usually from 5–6 individuals and more) | Mixed (solitary / pair / group) | |
| Temperament | Semi-peaceful (dangerous to smaller ones) | Peaceful (regular) | |
| Swimming level | middle level | 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 + Black Molly not recommended
- Goldfish + Angelfish not recommended
- Goldfish + Common Guppy with caution
- Goldfish + Neon Tetra not recommended
- Goldfish + Common Platy with caution
- Goldfish + Bronze Corydoras with caution
- Goldfish + Sumatran Barb not recommended
- Goldfish + Oscar Cichlid not recommended
- 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