the fry are probably the offspring of some other male from the tank at the lfs,this is often the case with most livebearers .......... in britain they only keep guppy females apart from males.but they are often pregant anyways!!!?!?!??!

. all other livebearers are kempt in mixed sex tanks so usually the colours are all different so odd mix of fry could be expected when buying females.......

u can often tell when a female is preganant with platys becase they dnt mate unless have to..... then they stick with there chosen female untill fry are born! , where as with mollys its choose a partner and mate all the time!!!!! even when the fmelae is probably pregnant!!

this is only form my experince...
