I agree, it could be too many worms. However, worming them is not the cure for everything. Unless you see worms in their poop, do not worm them. If you worm them when they don't have a worm problem then you are doing harm and no good. Last winter, I was worming my bantams. I used the correct dosage and followed the instructions. One of my frizzle hens had a bad seizure and died while she was on the wormer. Do not worm your birds unless it is absolutely necessary.Oh yeah, can't believe I forgot that one. If their combs are not bright and red...they ain't feeling good. If they ain't feeling good it could be too many worms. And they won't lay well.