If you have the necessary tank space (over 200 gallons), then silver arowanas might be a good tank mate for your Oscar. Silver arowanas are very long eel-like fish that can grow up to 4 feet long ...

The oscar fish, a unique-looking fish from ... Oscars do best when kept in a spacious tank with other oscars or with other cichlids that are big enough to hold their own (but not so big that ...