It's normal for them to lay with their legs sticking out behind them.
I think I read something about people teaching their ducks not to bite just like you would a puppy. You could try doing a search.
I would increase the brewer's yeast. You're just about at the recommended level. I had one duckling who laid down a lot too and improved when I increased the brewer's yeast. They were getting the recommended levels before but this one needed a little more. You might consider reducing the protein...
Looks like a nice big space for them. You might want to move the lamps further to the back instead of the middle though. That will give them more space to move away from the heat if they get too hot.
Good to hear. I just want to make sure. I've seen quite a few posts were people got ducklings but didn't know their basic needs. I figured better safe than sorry. Seems like you're off to a great start.
I agree that they get messier and smellier as they grow. Soon they will discover that they...
I agree they are most likely Pekin. That is the most common breed sold in feed stores.
Are you brooding them in that basket or were they just out for a little visit? I'm asking because young ducklings need to be kept warm. They should have an area in their brooder that is 90 for the first week...