I have a 150 setup right now with africans. try to mix up where the species live just pike a reef ie bottom/mid/top free swimming. I have some daffodil brichardi, 4 julidochromis trancsriptus, 4 calvus, 6 yellow labs, and breeding quad of electric blue ahli as well as 14 petricola catfish. They are all doing great and have tons of room to breed/escape aggression/hide etc. any more fish would probably be pushing the limit aggression wise.
You can always throw a ton of the same species or lake in as juvies like peacocks or mbuna etc if theyre all males. If you want mbuna, then stick highly advise to go all mbuna since theyre super aggressive, but if you have the space upu can make it worl woth otber studf(like my tank...plus yellow labs are super mellow in comparison to some mbuna I have had like zebras or johanni that were pure evil)
If theres any females and they want to breed then forget it...dominant male will go scorched earth and kill.
Pm
Me if you have any questions/etc since this is the reef forum haha