Has anyone else had gnats on their rooster's combs? They'll come and suck blood until they can hardly fly away, and leave blood spots on his comb that are probably 1/8 - 1/4 of an inch big. Then the hens come and peck it. They do it to the hens a very little bit, but not nearly as much as they do to Franklin. Is this normal, or is it there something wrong with him?