i gave my ducklings the all-purpose stuff, non medicated. i love my ducks so much i don't even care that i have to change their water 400 times a day. mine have been free ranging and on no commercial feed for about four months and they are huge, happy and healthy. one poster was right about them not being very friendly like a chicken could be but i've heard of people that hand fed their ducklings all the time and when they were big they continued to come to them. be sure and post pics when you get them.