Hmm, that's Belgian bantams for you. The reason for their behavior is that they have no respect for you. If he really is attacking when you turn your back and not just biting when you grab him then I can understand why you'd want to get rid of him. I have a pet cuckoo d'Anvers and he attacks us for attention. Constantly. Partly because he wants to get picked up and coddled. Sometimes I would just pick him up and put him in another room to give me some space. He's so friendly and mean at the same time. He loves his "wife" Sally though, another d'Anvers. He is the most faithful rooster I've ever seen, only ever paying attention to her and roosting beside her. Eventually, my mom decided she had enough of his funny business and caged him with the other d'Anvers males (of whom we confined to help the females condition, not for behaviors.) He deserves far worse, but I don't have the heart to do it. Now Sally roosts alone.