The blue is closer... She has the black gravid spot. Do you have a plan for the babies? Livebearers will overpopulate fairly quickly, so unless you have a plan for lots of babies, you probably don't want to separate the moms into the breeder box. It will stress mom out, and they usually look ready to pop for a while before actually giving birth so they end up sequestered for a while. A few babies will survive in the main tank - more will if you have plenty of hiding spots (plants, real or fake, for them to hide in). And then the females will continue to make more...