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Siamese Fighting Fish and Oscar compatibility

Compare these records as a starting point, then account for the actual tank, group size, individual behavior, hiding space, diet, and current health.

Likely incompatible

Siamese Fighting Fish

Betta splendens

Temperature: 75–86°F
pH: 6–8
Minimum tank: 5 US gal
Temperament: Aggressive
Source confidence: High

Oscar

Astronotus ocellatus

Temperature: 74–81°F
pH: 6–8
Minimum tank: 75 US gal
Temperament: Aggressive
Source confidence: Medium

Compatibility signals

Oscar can eat Siamese Fighting Fish
Temperament conflict: Aggressive + Aggressive
Both species are territorial

Catalog provenance

Built from immutable TankForge catalog IDs. See the catalog methodology before making a stocking decision.

Catalog methodology

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TankForge keeps tests, care, reminders, livestock, equipment, and trends together.

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