I'll be danged. While doing my WC/gravel vac this afternoon, I saw something unusual moving and bent down with my nose against the glass and lo and behold- a single platy fry! I didn't even realize anyone was expecting! My female tuxedo platy had been looking a little plump, (but so do I, and I'm most certainly not pregnant) but because she's black on the back half, I never saw a gravid spot. With four platys and six danios in the tank, that fry must be a very clever little guy (or gal) to have survived!