I have a Wellie Rooster and hen, both 15 mths old. And a Barred Rock, supposed to be a hen, 7 mths. They are molting and Henny has stopped laying. Pebbles the Rock has not started laying yet. I am finding white flakes on the poop board under their roost. And, I just noticed Kellogg's comb has white 'stuff' on it. Anybody have anything to help me out there?