I have a red head cichlid, he is about 8-9 inches now, purchased at about 2 inches. Very beautiful fish has a red purple head. He has grown up with red hook silver dollars, convicts ,blue acara's, a,pleco and a large angelfish in a 100 gallon tank. This fish is peacful, but is clearly the ruler of the tank, for sure. This fish has about the same temperment as a 13 inch oscar I once had. This clearly does not mean all are like this though, unfortunately fish seem to be pot luck, all the reading and research sometimes just doesn't work out. They just have their own personalities.
I understand that redheads can not live with each other and are hard to pair up as a mating pair. If the male does not except the female he will kill it. I have never tried this nor have had more than one, only repeating what I have been told. I also understand that the males reach 12-13 inches and females slightly smaller.
I feed this red head , wardly cichlid pelletes, kelp pellets by omega, and 8 veggie mix by HBH. They are omnivores.
If it is at all posible, I recommend mixing any cichlids with other fish while small juvenille fish and allowing to grow toghether, this has always worked well for me. Large cichlids of an aggressive nature also need large tanks, bigger is better.