I use a little dixie cup and defrost the cube in warm water making a sort of shrimp stew. I then pour in a little at a time in waves. That way it doesnt all sink and the slower fish get a chance to realize whats going on. Once I see the fish starting to let stuff hit bottom I stop.
Because I have a small tank, I use half a cube and usually dont need all of it. In addition, to make it easier for them to eat, I slice it up into thin slices with a razor blade before putting it in the cup. They used to have a hard time choking down the full sized shrimp. I tried baby shrimp but those were too small.
HTH, we had to start using frozen brine shrimp to feed our gobies who wont eat the flakes. I dont use bloodworms because the girlfriend refuses to have anything named "bloodworm" in our freezer. I cant say I blame her.
Regards,
Artuk