Hi everyone! I have a 4 week old duck and i need to start him on different food. Right now he eats DuMor 20% starter crumbles, but I was wondering what I should give him next. I tried to look at tractor supply to find some 16% unmedicated crumbles but all I saw were layered feed, which I know is not good for ducklings. Do you guys have any recommendations on brands to try?