henry - I use the left over crumbs of flakes in the bottom of fish food jars - if you dont have any of that then just finely crush up some flakes. they also make a liquid food but i dont use it.
There is also Hikari First Bites, HBH Fry Bites, and HBH Baby Bites. I have some of all three, and the teeny crumbs left in the bottom of food containers and mix it up for them. Also, I get a small, clean cup (like the size of a dipping cup for hot wings), put some tank water in it and soak the food until it sinks in the cup. Then I feed the fry. The food will sink right down to them since they normally don't come to the surface to eat.
cool,thx