It depends on the personality of the roosters, but I think you will find in the next few months your two little roosters becoming obnoxious and harassing to your pullets. Rosters sexually mature sooner than hens and begin to try to mate them while the pullets are screaming and running. 
In the end you will have one too many roosters with your hens and they will quickly become bare backed from all the mating. Whether the roosters will fight each other or form a coalition will depend on their bond and personality.
 I personally would look remove both as they start making the hens scream, or at least remove the most trouble of the two. You will need a pen next to or inside your coop to house them. You can swap them out if you wish. You will eventually find that one is better than the other. It can take a year for a rooster to mature fully and to stop being such a pain. If they are still causing troubles after that they shouldn't be kept with hens.
Being as you are new to chickens, roosters need a calm confident owner, and some understanding of their behaviors, and in my opinion they shouldn't be over handled. Aggressive roosters are not fun.