Welcome to BYC. Glad you decided to join our flock. Sumatras are beautiful birds. I'm sorry you have so many cockerels. As tempting as it may be to keep them all, you need to re-home some of them for the sake of your hens. The recommended rooster to hen ratio is 1 rooster for every 10 hens as too many roosters can be very hard on your hens; over-breeding them, biting and plucking feathers from their necks and backs, battering them, and potentially seriously injuring them. The good news here is that you can probably re-home such unusual and beautiful roosters much easier than you would be able to re-home a lot of other rooster breeds. Please feel free to ask any questions you may have. We are here to help in any way we can. Good luck with your flock.