I have 5 quail that hatched in the last 5-6 days. I have been watching them closely because last time, I had to put a few down because their toes were messed up. I have discovered today that on 3 of the 5, there is at least one, but usually more, toe that is black on the end, to include the nail. How do I stop this and what is causing it? Thank you for any help.