I did forget about the molt; the RIWs went through a decent one. No one else molted, because they're all under a year. Every sussex hen dropped her tail feathers, though. I saw a pullet eat a feather the other day and I got worried, but she only did it once, so maybe she was just curious.

I gave canned salmon to the worst of the RIWs, which happened to also be the sickly two. They went through their five days of tylan, but today one still had bubbles in her eyes. So I'm going to worm, and maybe treat again? And if there's no improvement, I guess I'll cull them both.