Good advice from petspoiler I think. It's totally true about the interaction between the parents and them. When you remove them they get real stressed some times, and the natural way is really amazing.
As for food, if your tank has been running for a while there will be microscopic stuff in the substrate that the fry will feed off of while they are tiny like that. For me I have honestly never bought any purpose made fry food. I always crushed up flake real well, sort of dip it in below the waterline so it sinks right away and let them figure it out. Some people might have reasons why they prefer something else, I just gave what I had lying around. They get big enough to eat real food fast anyway. My fry would try eating bloodworms that were 3x as lon g as them. They could barely fit it in their mouth. It's hilarious. That being said if you have food for them, perfect.