At times the eggs hatch with 24 hours, and the parents hide the fry, you probably will not see the fry for a few days. During this time the egg shell the fry have hatched from, will turn white and fungus over. At this point the fry are wrigglers and are feeding from a yolk sac, so you do not need to feed, they can be in this wriggler stage for few days.
Once they are free swimming,(this is the next time you see them) they will need to feed.
Newly hatched artemia (brine shrimp) are a good first food, as is any algae in the tank.
Don't rummage around in the tank looking for fry, this will scare the parents into eating the fry.
here are some wrigglers, they are almost transparent, very hard to see.
below newly free swimming fry
at the free swimming stage it is best to give them many small meals per day.
You can pulverize pellets, flake, or thawed peas and shoot them into the school of free swimmers with a turkey baster or pipet to get food to them.
I usually mix pulverized for with a little tank
I start hatching artemia about a day after I notice the eggs have hatched