They live in good sized shoals in nature, with lots of females per male, however, the aggression is spread, like in a malawi tank and you don't get problems (well, not too many).
I've heard of people planning these set ups, but they tend to go quiet (I suspect due to the tank needing to be large and well maintained, along with the cost of the fish, resulting in other things being put in such a nice tank).
Traditionally they're kept in the hobby in small harem groups, 1-3 females per male, which spread male to female aggression, but do look out for female to female aggression, they'll want plenty of secluded cave like areas to call their own.
I've also had mixed results with them with cories. Most ignored cories unless they were breeding, a few hated them and forced them to be moved to another tank. I suspect that the flame colour variant is more aggressive.