So I have a 120 gallon with one 10" and 6" green terror, a 7" A. Diadema, 5" red head geo and a 6" jaguar (going to try to sell). Everyone is friendly and there's never any fights but I want to add one or maybe two more fish. I want them to be South/ American cichlids that come from the same area as the other guys. I picked up a rainbow cichlid that I'm letting heal before he goes in, but what else should I add?