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Siamese Fighting Fish and Goldfish: can they live together?

Verdict:not recommended

  • Behaviour: not recommended
  • Water: the shared range is very narrow

Why

The water hardly matches: Siamese fighting fish need 22–28 °C, goldfish 18–22 °C, and the only shared point is 22 °C. A goldfish grows up to 30 cm and needs a tank of at least 300 l, while a Siamese fighting fish is, as a rule, kept alone.

Water and size

Water and size
ParameterSiamese Fighting FishGoldfishShared range
Temperature22 – 28 °C (72 – 82 °F)18 – 22 °C (64 – 72 °F)
22 °C (72 °F) the shared range is very narrow
Water pH6 – 86 – 8
6 – 8 ranges overlap
Water dH5 – 195 – 19
5 – 19 ranges overlap
Size in aquarium7 cm (2.8 in)10 – 30 cm (3.9 – 12 in)
Required aquarium volumefrom 40 L (11 gal)from 300 L (79 gal)
KeepingSolitarySchooling (usually from 5–6 individuals and more)
TemperamentTerritorial (often aggressive)Semi-peaceful (dangerous to smaller ones)
Swimming levelnear the surfacemiddle level

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.

Siamese Fighting FishGoldfish Check in the calculator Compatibility chart

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