I have 9 10 weeks old chicks who randomly eat feathers. These are just feathers that have fallen off and I haven't noticed them pecking a each other. It seems they're molting which I've read is normal at this age. I've also read that this could be due to lack of protein and I still have them on Chick Starter feed. What can I do to add some extra protein? Should I also be giving them Feather Fix feed?