The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
A pretty aggressive fish. They do best in large groups (10-15) to distribute their aggression....or alone. I wouldn't put them in a tank less than 55g alone with other types of fish. For a group, you'll want atleast a 75g tank IMO.
I have my demasoni in with a bunch of juvenile and breeding yellow labs. The demasoni will chase the other labs ... but that's about it. He doesn't both my yo-yos or the synodontis catfish. I've heard the same thing about demasonis ... you either get 12 or 1 ... if you get less than 12 you end up with 1.