FL4+1, don't stress too much about foods. I normally feed my fry using nothing more than the flake used for my adults. I simply pinch a bit between my finger tips to make it a bit more suitable size for the fry.
I feed flake food, very finely crushed. Every now and then I have also added daphnia or bloodworm, bacisally the same diet as the adults. They are doing well, all growing nicely. They will go into the big tank soon and then I can sort the small tank out. It looks bad at the moment, so babyish gravel a plant stuck in there and just not pretty.