Can Siamese fighting fish Live With Harlequin rasbora?

Detailed assessment

Both Siamese fighting fish and Harlequin rasbora share a comfortable temperature range of 24–28°C (Siamese fighting fish prefers 24–30°C, Harlequin rasbora prefers 21–28°C). Their pH ranges overlap well at 6–7, so water chemistry is compatible. Siamese fighting fish is moderately assertive (temperament score 5 out of 10) but generally tolerates peaceful tankmates like Harlequin rasbora (score 1) when given enough space and cover. Overall, these two species can coexist peacefully in a well-maintained community tank with appropriate space.