I have found several things to feed fry that work.
Powdered Spirulina is excellent.
Live baby brine shrimp another good choice.
Decapped brine shrimp eggs.
several foods will work hikari first bites, azoo artificial artemia, mike reeds fry food, eggyolk, liquid fry food, powdered flakes, shaved or freeze dried beef heart.
The are many live foods that are also used like micro worms, vinegar eels, etc
For the best growth look for the amount of protien.
A varied diet of live and growth foods is better IMHO.
Anyhow Mike Reeds fry food has given me very good results I also use spirulina powder and live baby brine shrimp. As the fry get alittle older I start feedings of vita pro, growth flakes, freeze dried beef heart, tubifex worms, decapped brine shrimp eggs.