Cute baby fry! Can you imagine that amount X's 12 months as they have a batch every month. I have a community tank so some get eaten sad but I can not keep all of the ones I have. Most get rehomed on craigslist cheap when they are fry. I rehome them at my Tropical fish club's auction that they have once a month before each meeting. Get a magnifying glass at Staples so you can see them better and when you sort them out when they start to mature to tell in they are male/female.
Keep the stronger ones and rehome the smaller or deformed ones. If you grow them out to adulthood keep the ones that your like and rehome the ones that do not make your standards. Breed the good ones back to the bothers or sister as this is fine. The stronger and bigger ones make the better ones to keep. This way you will have nice livebearers and not have alot of problems later with weaker ones if that makes sense. Each generation you will reach your goal in the color or size you are breeding for.
Make sure you do more water changes as extra feeding of fry and the amount of fry you have will effect the water qty. Make sure you use a net and put the siphon hose in the net as you do not want to suck up the fry when cleaning the water out. It is also a good idea to to put some netting over the intake vavle and secure it with a rubberband or tie wrap so babies do not get sucked into the filter. This will need to be cleaned out every few weeks so that it does not get clogged.
I use a spice grinder to grind up tropical flake food mixed with freezed dried brine shrimp and bloodworms and make that to a fine powder food for the babies. Use a toothpick and dip it into the water then into the powedered food then in the water. Making your own baby fry food is cheaper then buying it at a petstore.I only feed my babies 2X a day but some people feed 3-5 times a day. Feeding more messes with the water qty.
Good luck in raising those babies. It's so fun to watch them grow and develop. I never get tired of raising them but I only do about 12-16 at a time and do not keep the babies born the following months. I let nature take it's course in my community tank.Fry over the 12-16 limit of mine get rehomed. I keep my babies in a 10 gallon tank to grow up in with out any other fish to bother or eat them.
Congraulations on your new babies!