I have a Black Copper Marans Rooster whose cape and tail (feathers on back in front of tail) feathers look frizzled, almost more like long matter fur than feathers, and the neck skin is bright red. I will make my best effort to post a picture. The 9 hens all look really good, no sense that there is a coop-wide issue. So I have some questions: 1) Should I give antibiotics; 2) I can separate the rooster in the run during the day and then let him out in the evening so that the hens are not exposed to the antibiotics, sparring the eggs- Is this advisable?; and, 3) if I separate the rooster and he can still see the hens (I have a dog play pen that I can use to section off a good sized area in my fairly large run) would this be a problem for a rooster? He has started to get a little agressive (in the last week) maybe in coincidence with the poor look of his feathers. He is not normally a petting rooster, but generally would just keep his distance from me and would take treats from my hand when offered (as long as the hens were otherwise occupied with their own treats).