The females will stay a dull color while the male will sometimes display a little red and maybe even some slight green. And from the looks of it, fishes33 has a female. These fish aren't your everyday cichlid and are quite rare. I plan to get a group someday for their piscavorous behavior.
Here are pictures borrowed of pyxischromis orthostoma from a fellow member on a different board with permission. Look at their appetite! This explains why I want some.