I have found that my cory's come to the top for both worms and flakes. Of course they don't have to do anything special to get to their shrimp pellets or algae wafers
they know when I feed and they come out the same as everyone else, even if they were sleeping just prior to my lifting the hood. I feed them along with everyone else in the tank so they are on the same schedule in terms of variety. I feed pellets 2-3 times a week, algae wafers when not feeding pellets, and flakes almost daily. When I am not feeding flakes I am feeding worms. Everyone on the community seems to enjoy everything I give them. I have not ever considered sinking cory pellets, I will take a look the next time I go for food!