Welcome to permies, Aspen!
What breed of duck?
Have you tried soaking a little whole wheat overnight to give your ducks extra B-vitamins? My ducks get commercial
chicken feed along with veggies, but chicken feed doesn't have
enough B vitamins for ducks, but the soaked wheat in the bottom of their
bucket makes sure they dunk their heads to clean their nares as well as giving them extra vitamins, and as a bonus, they adore it.