Oh don't worry I would never put a large aggressive with smaller fish. Discus are out of the question lol because I hear they are very picky about water conditions, and kind of wimpy. Thats what I have heard. I think what I will do is stick to small cichlids such as fire mouths and convicts, just to get use to cichlid behaviour. Then I will move on up to a green terror or other large cichlid once I know what behaviour is ok and what behaviour is problematic. I really hope I get it right the first time, so I will be doing lots of research with the species at my local fish store. How does that sound? P.S. I will not sell fish I have bought unless I made a completely stupid mistake or they have bred, so the fish I get will stick with me their whole lives, and I am not interested in breeding.