I previously had a H. melanurus, M. meleagris and C. rubriventralis together in my 65g. The melanurus and rubriventralis were both too aggressive for my liking ( I'm sure this was compounded by the small tank size). The leopard never acted natural until both were removed, now I have the leopard and a C. jordani that get along great. In my experience, the rubriventralis will end up being a bully.