They both look like males to me. I guess time will tell weather I'm right or not. Mature males usually have a small pointed protrusion sticking out that looks like, for want of a better discription the tip of a pencil point visable when veiwed from the side. These guys can breed at a relativly small size so you should be able to notice it although it might be more visable in the dominant male. Maybe some of the members more experianced with this species will jump in here with an opinion.