I think op meant that the coop could hold more than 20 birds.
Being raised together has very limited influence on behaviors of chickens or roosters. It is more dependent on space, and the layout of the space.
I am rather curious what your run looks like? Can every bird see every other bird in the run at all times? If so, that is what you need to change. Many runs on here are just an open area. What you need to add is clutter. It will look more crowded, but it will be much more interesting to your birds, and allow birds to get out of sight of each other, get away from each other.
Add mini walls, totes laid on their tides, cardboard boxes, pallets leaned up against a wall or fence, or up on blocks creating a platform that birds can get under or on top of. Add ladders, chairs, sawhorses, roosts. Make more use of the third dimension of space, the vertical.
Add multiple feed stations, set up so that a bird eating at one station cannot see birds eating at another station.
But if this does not help, or if things get worse, then keeping these two roosters together is not a good idea. Roosters are a crap shoot, the more you have, the larger the chance of it not going right. Some roosters can live together, and some can't. Let one or both go if it gets to that. Rotten rooster behavior can ruin the whole chicken experience.
Mrs K
Being raised together has very limited influence on behaviors of chickens or roosters. It is more dependent on space, and the layout of the space.
I am rather curious what your run looks like? Can every bird see every other bird in the run at all times? If so, that is what you need to change. Many runs on here are just an open area. What you need to add is clutter. It will look more crowded, but it will be much more interesting to your birds, and allow birds to get out of sight of each other, get away from each other.
Add mini walls, totes laid on their tides, cardboard boxes, pallets leaned up against a wall or fence, or up on blocks creating a platform that birds can get under or on top of. Add ladders, chairs, sawhorses, roosts. Make more use of the third dimension of space, the vertical.
Add multiple feed stations, set up so that a bird eating at one station cannot see birds eating at another station.
But if this does not help, or if things get worse, then keeping these two roosters together is not a good idea. Roosters are a crap shoot, the more you have, the larger the chance of it not going right. Some roosters can live together, and some can't. Let one or both go if it gets to that. Rotten rooster behavior can ruin the whole chicken experience.
Mrs K