My Chicken all got along fine until they "went through the change" so to speak. Now my roost constantly attacks the hens. He jumps on them, holding them down and pulls out their feathers or creates sores on their backs. And now this week he has started attacking the ducks as well. No matter what I do( separating them, holding him, hand feeding him and so on) he just continues to attack the others. And he doesn't stop until he really hurts them. When I am outside with them, I am constantly pulling him off the others and defending myself. The spray bottle doesn't work either.
and Welcome To BYC! X2, unfortunately that can be normal adolescent rooster behavior, There are some good articles on raising roosters / bully behavior in chickens in the Learning Center that you might like to check out 
