I've got a male and 3 female auratus in my tank, but I've mixed with everything from the docile rusty sprengae to tthe more aggressive kenyis. As long as you got the space and hiding spots as well as sufficient overstocking levels I recon pretty much any Mbuna will do fine. Having said that my tank is a 90gal so yours might be pushing it on the small side. Oh, also I'd stay away from adding any more from the melanochromis subspecies, so stay away from the maingano, johanni and perileucos in particular. That's what I've found works at least.