Most all of them will eat mysis shrimp. I take the frozen squares and chop them up frozen then defrost so they are now smaller pieces and the larger pieces will get eaten by the larger fish
The standard (small) NLS 1 mm pellets are to big for most of the young clownfish you will find. NLS makes a .05 mm that they will gobble up, but only come in a large jar I think but they are most certainly hard to find. You can take the 1 mm pellets and grind them up in one of the plastic pepper grinders that you can pick up in the grocery store full of pepper corns. You can pull the top off but it takes some doing, then fill it with the 1 mm pellets and grid them on the water surface. Trust me they will eat these pellets and with gusto! My smaller male taught me this..
A small jar of 1 mm pellets will last you several months so in the long run isn't very expensive.
I don't have any fish in my tank that will touch the flakes so I've got a large full jar I'll make a good deal on if someone wants to pm me.