Hi, I am getting two crested pekin ducklings today and I have a few questions. I have 3.5 week old chicks so I have a big bag of 22% chick starter crumble. Is this ok to feed my ducklings with? Also, I have been reading a lot about Ducks or ducklings needing more in their diet than chicks do, such as Niacin and other vitamins. Is this true, and what can I add to their diet of starter crumble if this is the case? If I am feeding them other things such as veggies to get these vitamins, should I be supplying them with grit as well? Any other tips on raising ducklings would be appreciated...my chicks are doing well and are almost ready to go outside, but I have never raised ducklings before! Thanks!!