Hi, so I am currently cycling a Red Sea reefer 140 gallon tank (60x25x24). I am upgrading from a 75 which currently has two small red spotted gold severums. In the new tank I want to add geophagus to the tank, my question is can I add just one or two of a couple different species of geophagus? I read that they like prefer to be in groups of 4+ but wasn’t sure if I could get like two balzanii geophagus and two red head geophagus and they would maybe group together? I’m mainly nervous about aggression in the tank. But if that even does work is that too many fish along with my severums in a 140 gallon tank? Thanks!