Can I ask how you all treat bumble foot? And how you house them during treatment?Agreed!
And check their feet- I bought a trio of ganders from somebody that kept them in a muddy dog run and two of them had bumblefoot. It was a good month of intensive treatments, but they made it ok fortunately.
Nice orange bills and feet (when not setting), are a good way to be sure they aren't really deficient. The ones in the pic look good to me.
I love the way waterfowl are so hearty. Never had any problems with diseases, just predators.