Hello, I have a few questions. I will have had my ducklings for 3 weeks this weekend. I read up on everything etc. I also got 5 chicks at the same time (tractor supply and the more I read the more I realize I shouldn’t listen to people at the store). I gave all the birds the same medicated formula for the first week and a half (which I see now wasn’t needed for the ducks) than I got them Purina layena crumbles (which our popular local barn/animal feed store told me was good to get and now I’m seeing other wise) the ducks are doing what seem to be fine, but today i am going to buy Purina duck feed pellets, because I am starting to notice them go bow legged, when I purchased them they were on the same food I got them originally, but I just assumed the food contained what they needed (never assume) now I know they need niacin in their food or water, am I too late to start this? Because I am hoping I am not. The ducklings have become my best friends and I would hate to know that I messed up their life because of this.