i'd say so.Discus are cichlids and cichlids and siamese fighting fish don't get on.Though discus is one of the more peaceful cichlids but grow to a decent size.Im not sure but personaly i wouldnt go for it.
No, didn't go in, just impacted on the surface. That seems like a no-go if you ask me. I would never consider putting a betta in with any cichlid. BTW cichlids just get WAY too big for me to even handle. I like smaller stuff that's less likely to tear up any lil' buddies you buy for them. I'm getting some serpaes for my NON betta tank. The betta's got his own pad. probably gonna get more rosy reds, too.