this last pic 100% female. and is that the larger one? the pic right before this looks female too that you said was male, the one in your avatar. look at the dorsal and youll see the black spot protruding into the dorsal which indicates female. the males dorsals can darken to but its mood change and the stripes fade into the dorsal they dont have permanent spot like the female. when im sexing my young festae thats the first thing i look for is the spot on the dorsal versus the stripe. also females can have just as much spangling as the males but in most cases they dont and will loose spangling on the fins as they mature.