I have had cichlid-wise true green terror (stalsbergi), true red terror (festae), green severum, and a group of 3 geophagus brasiliensis. No problems, currently have all of those w/ 2x cb endli and 2x F1 teugelsi (rapps).
Non-cichlid; IT datnoids, red wolf fish (this guy pushes em around sometimes), striped raphael cat (he would crash into my bichirs so I sold him), needlefisfh (aka Asian needle nose "gars"), peacock bass, rope fish. I've kept all these with my larger guys and they got along just fine.
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