I am still new to this and my hens have been laying for a few weeks. Today when I went down to collect eggs, the bottom of the pecking order had quite a bit of blood on her comb. There are 3 double wide nest boxes, but they all use the same one. They are never agressive towards each other, so am I to assume they were fighting over the nest box? How should I treat her comb? Will they continue to peck at the blood or was this a one time deal? Thanks