I picked up a single male and a single female platy today. I think they are male and female because of the different anal fins but I'm not sure. anyways, how can I tell if the female is pregnant? How big do they have to be to breed? they are around 1" long currently. would the male breed with multiple females if i got more? thanks for the info. I have them in a 16 gallon bow front and i plan on moving the fry to a 26 gallon bow front. thanks all!