Agree with Bagu on the female. Cannot confirm the male though, from a distance it does look male but to be sure is there any chance of a closer pic, cannot properley see the fin margins (might be me though).
funny enough they were displaing to each other the other day and the fat one whos usually plainer with oink tummy developed all the black markings that the smaller more male one has
Male GBR in foreground, female in background. Its hard to tell much from your photos, but I guess I agree with everone else. The suspected female GBR looks strange to me tho.
This one shows the same male in front, with his mated female in the background, they show more colors when they are paired up.