Babies won't eat right away it takes about a day or two before they start picking food.Now,do you have a nursery tank or are you keeping the fry in the same tank with the parents?If you have a tank for the babies,make sure that you don't over feed them once they start eating.Feed them as often as you can but,making sure that you don't put too much food every time.Provide them with a rich balanced diet. See if your local pet store carries baby brime shrimp either live or frozen.Crush regular flakes with your finger and feed them that.Also,and this is very important,you MUST do water changes on a daily basis.10% would be good,every time adding water conditioner.--Babies don't like sudden water changes--.
Now if you are kepping the babies in the same tank with the parents,given that is a nice "matured" tank there won't be any problems as the babies will eat any algae growing in the tank or any flake falling to the bottom,the only problem might be the parents or any other fish trying to make of the babies their next meal.
If your babies are going to stay in the same tank with the parents,I can tell you how to make the parents ignore the fry.Let me know.......
Good luck,and let me know how's going ....................Harry