Feed training crappie requires a sinking feed. They don't like to feed on the surface.
That may be true to get them started on the feed, but they can be feed trained to eat floating pellets. I do that with the Hybrid Crappie that I get when I hold them for more than a week or so. The Optimal Starter #4 has a low % of slow sink feed, and once they are feeding on the floating feed I switch to Optimal Bluegill Jr. If you stand next to the holding tank when feeding them you WILL get wet after about a month on feed.