Welcome to BYC, AdaBeth. Glad you decided to join our flock. I'm sorry about your aggressive rooster. The other members have given you some good suggestions to try to break him, but I can tell you from 50 years experience, it is very difficult to break an aggressive rooster. I agree with drumstick diva; there is no reason to keep him. You don't want to risk him injuring someone (like putting out an eye), especially if there are any children around, and you don't want to breed that kind of aggression into your flock. The only reason that anyone really needs a rooster is for fertilized eggs and the recommended ratio of roosters to hens is 1 rooster for every 10 hens as too many roosters will be very hard physically on your hens; over-breeding them, biting and plucking the feathers from their necks and backs, battering them, and potentially, seriously injuring them. I currently have 25 hens and no roosters, and I get loads of eggs without all the aggression, fights, non-productive mouths to feed, crowing in the middle of the night, over-breeding and battering of hens that does along with having roosters (especially too many). My hens are stress free and enjoying life without roosters around to make them miserable. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck in dealing with your rooster.