Google it, There are websites that sell live rotifers. You need to have a healthy phytoplankton culture first. It is very possible to raise the baby fish, but it takes a lot of research and a lot of work. And, as said, get set up before you even attempt to raise them. Just let this batch (and maybe the next couple) hatch in the tank while you get everything else ready. The first batch or two often don't get fertilized as well anyway.