Rob shouldn't be feeding enough flake for it to hit the sand or the rocks. I know my fish all come out for food, and there's no way they miss a thing. Definitely a lot cleaner than feeding frozen foods. When I've had fish that don't come out for food (like jawfish) I have target fed them with a turkey baster. Most (yep I said most) people have poor feeding techniques, and this is often a significant contributing factor to nuisance algaes. Most people overfeed.
Adding more flow near the sand is a good idea.
