As far as future tankmates in the 75g go, I'll warn you that I have a friend that has a Mayan that lived happily in a 75G with a Jack Dempsey, Convict and Firemouth for about 5 months. The Mayan started getting aggressive towards the Convict and Firemouth so he removed them and the Mayan and JD appeared to be buddies for maybe another month but then he came home from work 1 day to find the JD shredded. It didn't survive. So all might seem good at first but I doubt you'll be able to keep anything else in with him long term.