if you dont have a separate tank, adding more plants (into the substrate and floating ones) and decorations like wood, caves etc will help the babies hide and survive on their own - even placing a few plants in a cluster bunch off to the sides of a tank help the fry since the adults will be too big or won't bother trying to fight their way thru all that mess and be sure to keep the adults fed just a lil bit more while the babies are growing - also, make a few extra water changes - about 25% every 3 days just to keep the ammonia down with the extra bio-load of babies and food. BTW congratz!
ps. livebearing adults will eat their fry, even egglayers do - it's Nature's way of culling the weak from the strong - and do not despair if some babies don't survive - that is Nature also taking its course whether we like it or not, of course we try to prevent this much of the time being the fish geeks we are