Just because the RES don't come to the surface doesn't mean that they aren't eating feed. Mine pick up pellets off the pond bottom.
Would it be a bad idea to mix a small portion (maybe 10%?) of sinking pellet food in with the floating just for this reason? To feed fish that don't transition to eating surface feed?
I feed some of both. Of course there is no way of telling if the sinking feed is getting cleaned up. In my case though, I'm pretty certain that the limited amount of feed I'm feeding is getting eaten (FHM and CC will clean up any that my BG don't get to first). If I were trying to feed the maximum amount they could eat, I would be more leery of feeding too much sinking.
