@Miss Lydia how long/often do you give the B Complex? One of my ducklings has the exact same thing going on despite nutritional yeast and nutridrench, so I got some B Complex today. I hope it works. Her legs are way stronger than when I got her but there is still a clear difference between her and her sister. Interestingly, the shakey one is larger and I'm wondering if there is a tie to the faster growth rate.