There is a spot we sometimes pester carp, well a couple places, where the people feed the ducks. WE don't chum, but the "duck feeders" do it for us. One place they toss bread, so a floating "bread" fly does well. The other place they sell grain to toss at the ducks, so a "corn" fly on the bottom seems to work OK.
Ever thankful for ducks and kids.....
....lee s.