I just noticed today that there is blood on the bedding from one of the chicks. I have a Speckled Sussex, Golden Campine, and Easter Egger from My Pet Chicken and one Splash Silkie from a BYC-er. The MPC ones were vaccinated for Mareks before they were sent out. I don't know what to do! If I were to bet on who is poo-ing blood I would say it's the Silkie but that's only because she's the most lethargic of the bunch. They're on top of a puppy pee pad on top of Yesterday's News bedding. Any ideas? What can I do? Is there some sort of supplement I can give them? I don't want to lose one only a day into their residency with me!