It could also be one of the Gymnogeophagus, but very hard to tell sex from the angle of the shot, the profile of the head is often very telling of gender.
Here is a shot of some female Gymnogeophagus quilero (yerbalito), note the similar color pattern in the fins.
Also compare the much steeper profile, with a mature male below for sexual distinction.
Another Gymnogeophaine below, sp Paso Pache