Welcome to BYC. Glad you decided to join our flock. Just be sure and bake those egg shells before you feed them back to your chickens so they don't develop a taste for raw eggs and become egg eaters. You can also meet their calcium needs by keeping some crushed oyster shells in a dish for them. They will eat them whenever they need the calcium. As for roosters, you have way too many for the number of hens you have. 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 backs and necks, battering them, and potentially, seriously injuring them. The only reason you really need a rooster is to fertilize eggs for hatching and 1 rooster can easily handle 10-15 hens in that regard. I haven't had any roosters in my flock for a couple of decades now, and my hens have laid better than ever without the added stress of having a rooster around. If you do decide you want a rooster, I would get rid of the meaner one, keep the more gentle of the two and get 4 more hens to go with him. If you are still having problems with him afterward, I would get rid of him as well. There is no good reason to keep a bad rooster. You don't want to risk injury to anyone and you don't want to breed that kind of aggression into your flock. If you just have to have a rooster, there are loads of unwanted ones available on the market and you can always find a good one. Please feel free to ask any questions you may have. We are here to help in any way we can. Cheers.