Help with chiclids

i have seen red devils, jaguars, oscars, jack dempseys, and a few other things do well together in a 300 gallon tank. in a 90 you will be lucky to get 3 big aggressive cichlids to do okay together. are you wanting BIG fish, or would 4-8" be sufficient. jaguar males can hit about 20" and that plus one other fish would max out a 90 (assuming the jag lets it live). any chance you may want to go with a bigger tank?

i personally wouldnt consider africans. too aggressive, they usually end up killing eachother off. for 4-8" you could do some convicts, jewels (although they are from africa, they arent from the rift lakes like what you think of when you think of african cichlids), salvini, firemouth, rainbow, severum, keyhole, festivum, parrot, and there may be other more rare ones at your LFS from time to time.

Africans will be awesome in the 90, and with controled overcrowding, you could get a lot more fish than if you did a CA or SA tank (IMO these are just as likely to "kill each other off")

If you do Africans the right way, they will be fine together. You MUST have plenty of rockwork (I'm talking caves and such at least 2/3 of the way to the top). You MUST overcrowd them to a certain extent (this spreads out any aggression. Most importantly, you MUST choose compatible species. Mixing lakes or aggression levels (in order to get a "nice colorful tank") is the reason rift lake tanks fail as often as they do.

Not sure from you post, but wanted to let you know

Convict, Jack Dempsey and Firemouth are Central American
Kenyi is Lake Malawi African
Frontosa is Lake Tanganyikan African (also not aggressive at all for thier size)