Fry of most species of fish require a separate tank, already cycled. It's best to use a sponge filter powered by an air pump. Food for newborn fry would likely have to be rotifers. Once they grow up a little, they can eat newly hatched brine shrimp. After that they can eat enriched, two day old and older brine shrimp. Depending on water quality, daily water changes will probably be needed.
Here are some pages on rearing food for your fry. They are taken from seahorse.org, and even though you don't have seahorse fry, food rearing is still the same:
Rotifers:
http://www.seahorse.org/library/articles/rotifers.shtml
Brine Shrimp:
http://www.seahorse.org/library/arti...miaGuide.shtml
HTH.