I have just bought six Micky platys, and one of them is pregnant.
now i want to know when i should move her into my fry tank to drop her babies.
she looks a little like this
she does also have a dark spot behind he gills, but that's on all of my platys, and i can see what looks like ribs, she is eating, and i think i can make out a few dots in her tummy/womb area.
she typically strays from the group, and stays with one male by the filter.