I know of people who have kept them with africans, namely mbuna, never tried it myself. RTS/Rainbow Shark is a territorial fish, and probably will hold its own against mbuna, even to the point of challenging the dominant male, a fight which wouldn't be very nice to see, personally.
You could get away with it, or the fish could be instantly attacked (especially the bright fins). Not a risk I'd take. Also, come spawning time, there's going to be trouble! On a side note, is it just me or do albino's of any type of fish tend to get bullied more than their 'normal' counterparts?