Can Siamese fighting fish Live With Cardinal tetra?

Detailed assessment

Both Siamese fighting fish and Cardinal tetra share a comfortable temperature range of 24–28.9°C (Siamese fighting fish prefers 24–30°C, Cardinal tetra prefers 23.9–28.9°C). Their pH ranges overlap well at 6–6, so water chemistry is compatible. Siamese fighting fish has a temperament score of 5 (out of 10), which means it can be territorial or aggressive toward Cardinal tetra (score 1). The size difference is significant: Siamese fighting fish reaches 6.5 cm while Cardinal tetra reaches only 3 cm, and the larger species may view the smaller one as prey. Note: fish 2x+ larger may eat smaller tankmates species with non-overlapping ph ranges may not thrive together With careful monitoring and adequate tank size these species can usually coexist, but be prepared to separate them if aggression or stress appears.