If you don't mind if the male convict was ate maybe you won't mind if you sold him and stuck with the more peaceful group. Then you can expand your options here.
I currentlly have a Flagtail, a Oscar, 2 Senegalis Bichirs, 2 Green Terrors, a Festae, and a goldy pleco growing out to add with my NGT datnoid, Silver Datnoid, 2 Ornate Bichirs, 2 Endlicheri Endlicheri Bichirs, 2 Palmas Polli Bichirs, 2 Lapradei Bichirs, 2 Delhezi Bichirs, 2 Albino Senegalis Bichir, a Royal Pleco, a Tigrinus catfish and in time 16 other bichirs. All of them get along great the only one that worries me is the festae but it is my girlfriends fish and will be gone if I have any problems.
So if your looking for other tankmates I'd suggest what I have listed or other peaceful larged sized fish.