I have 13 five week old ducklings and they seem to have some sort of growth on their feet. I believe it may be bumble foot, but there are no black spots. 10 of the 13 ducklings have these large hard lumps where their nice soft foot pads should be. The tops of the lumps are rough and cracked. I started noticing signs of hard cracked feet when the ducklings were only 2 weeks old, but I didn't think anything of it until now. I raised them on horse bedding pellets for the first 2 weeks because I was told that the pellets would absorb the extra water keeping the ducklings cleaner. After those 2 weeks, I moved them to a 6 ft by 6 ft pen with hay for bedding. I added fresh hay daily to keep them nice and clean. If it is bumble foot, how do you recommend treating? I keep tricide neo on hand because of my koi, should I use that? I have no idea how I would soak, wrap, and keep nearly 20 duckling feet clean... Here's a picture of what I'm talking about. Most of the duckling's feet look like this. I have other pictures, but most of them turned out really blurry as the ducklings didn't appreciate being upside down for the pictures.