the first two days after hatching they survive on the protins gained from the egg sack.
when they become free swimming you need to feed infusoria(liquedfry no2) foe around 7-10 days. after that you can feed crushed flakes and baby brine shrimp.
when they are around 1.5cm you may start to feed glassworms etc.
you can add them to other fish when they are bigenough that they don't fit into their mouths (approx 2.5cm.)