Not a good idea.
1) Ghosts come from completly different water perameters then African rift lake fish.
2) Cichlids are well... cichlids. BGK's are relatively docile in comparison.
If it was a larger knife, established in the 125 for some time, and the Cichlids where able to handle the lower PH the BGK's pretty much require. You may have a chance. And since you said african's in generally. I'm assumeing you have some of the more commonly kept aggressive species? A complete stock list might change it.. But thats even if you can get around the 6.5ish softer water BGK's prefer and the 8.0 hard as nails water the Africans prefer.
I personally would not do it.