I edited the first pick to make it easier to see, and it could also be a female, but its still not obvious bright scales like the 2nd 2 shots. There also seems to be a slight blotch in the dorsal with color (also an Amatitlania female trait).
A better shot would help, determine .
Good lookin fellas there. My three girls seem to be doing okay. Occasionally one will hang out up high and another looks as if the male acara got her the first night but has since been okay(3/8 inch semicircle of missing scales on each side) and the dominant one sHes a beast.