Do a google search for Jack Dempsey fish.
As for the two I have, they have been the most subdued, wonderfully compatable fish I have. My oldest one has never shown the first bit of agression towards anyone, and, when recently paired with another somewhat smaller JD, the two by themselves have gotten along wonderfully.
They eat anything I feed them, although they prefer larger foods and are not a big fan of flakes. Peas, shrimp, convict fry, and pellets keep them happy and full.
JD's like cover, so provide some larger rocks or caves for them to hide themselves behind. In a stark tank, they will become jumpy and stressed.