Hi, this is my first time raising ducklings and I am having some issues with it already. I bought my ducklings from Metzer Farms and got serval varieties, right now I am left with a rouen, blue swedish, 2 gold star hybrids, and an unidentifiable breed. I have lost 5 ducklings over the last month to "leg issues" this seems to occur after I let them bathe around. Soon one duckling will not be able to move a leg, and within 24 hours he will be dead. What could be going wrong, they have a constant supply of water and starter food. They are currently under an 85 degree temp with no drafts. I am using hay as there bedding. What do you think could be going on? Please help!!