Fish have significantly more time to forage on a floating pellet - in my pond over an hour sometimes depending on wind speed and direction, and only a matter of seconds on sinking feed. I do feed my caged fish sinking feed or hydrated pellets occasionally, when I can monitor their activity through high clarity or via aquavu camera. Using cameras to document sinking feed heading to the bottom and have in fact seen a few YP graze it, however I've never witnessed another fish species interested in pellets on the bottom of the pond. As we all know. uneaten food becomes excessive nutrients which speeds up the eutrophication process. Since pond owners nationwide spend millions annually to slow that very process through various products and services, wasted food is a natural enemy for us. I would not employ sinking feed for several reasons mentioned by others, but primarily because of it's short time frame in the target zone for my fish.