I've been stymied by the suggestions to crush up flakes. There are always flakes mixed in that are too big for the fish and they get wasted and foul the tank. I finally tried running my crushed flakes through a dry fish net. The flakes that are<1mm go through and the bigger ones get caught in the net. Then I can crush those through the net too and, voila, food the fry can fit into their hungry little mouths!