What to feed guppy fry?
They make liquid fry food, you can also make infusoria buy chopping up a piece of lettuce placing it in water and leaving it tin the sun for a day, feed drops of that water until the fry are large enough to eat flake. You could also finely grind flake food untill it is a powder and give a tiny ammount (about the head of pin’s worth) fry come out with a small yolk sac still attached, so they can survive a day without food, but one that sac is spent they need to be fed small ammounts two or three times a day.