If you chicken is crowing, it's a rooster. Crowing among hens is very rare and almost always done by a hen who is several years old and has taken up the role of the rooster in a roosterless flock. As your roosters mature more, they will likely begin fighting. I would remove one of them (the more aggressive one) from the flock and get some more hens to go with the other rooster. The recommended ration of roosters to hens is 1 rooster for every 10 hens as too many roosters will become very hard physically on your hens as they mature; over-breeding them, biting and plucking the feathers from their necks and backs, battering them, and potentially, seriously injuring them. The only reason you need a rooster at all is to fertilize eggs for hatching, and 1 rooster can easily handle 10 hens in this regard. Good luck with your flock.