It depends on what size they are. Because you don't want to get a cichlid that is too small and gets eaten. I have a yellow lab in a 46 gallon with a bumble bee cichlid, Malawi Eye Biter, and an electric blue johanni. It dosen't really matter as long as you keep them with other African cichlids that are about the same size. Also don't put too many cichlids in a 29 together because that isn't a lot of room.
55 Gallon-two clown knifefish, chocolate pleco
46 Gallon Bow Front-Planted-swords, java fern and African cichlids, sail fin pleco
29 Gallon-black ghost knifefish, bristlenose pleco
10 gallon-brackish, figure-eight puffer, knight goby