I agree with everyone else...male. As far as food goes, guppies work well if you can buy a bunch and keep them in a separate tank. As they reproduce, fish out the fry and feed when ready. I'd keep away from buying feeders from stores often, they bring in disease pretty bad. Dempsey's can be carnivorous but I've found they relish herbivorous diets just as much if not more. But I've yet to find a cichlid that doesn't love bloodworm's and brine shrimp. A mixed diet of all of these things in rotation will give you an excellent, healthy Jack Dempsey.
The American Cichlid Guy