So I am just starting to poke around with setting up my AFS. And my question is about the pellets food and getting them to sink! I've tried a few types and they all just seem to float at the surface. My clowns don't care, but my tangs and especially my Marine Beta are not flying up to the surface to feed. When I feed I stop my Skimmer, Return and Powerheads, so it's pretty calm. Ideas/Thoughts?