Hello! Having ducklings for the first time I want to do the right thing for them. We were given Kewpie Hi Spec Chick Mash from the produce we purchased them from. It is medicated, though on the product summary from the supplier states it is also suitable for ducks. Today I have started sprinkling brewers yeast on top of their feed. They are one week old. Three questions really... Should I change their feed to non medicated game bird starter? If so, how do I change the feed over without causing any digestion problems? Should I be giving my sweets chick grit? Thank you!