Very normal for rams to spar and chase each other, especially if you have two wanna-be dominant males. You might try putting in rocks or some kind of shelter so that subdominant/s can get away if needed. If you start seeing nipped fins, try giving them even more hiding places. If that doesn't work you may have to seperate them. Basically, every male in there wants to establish his own territory and unfortunately, sometimes the dominant male wants the whole tank! This has happened to me twice in a community setting although the rams only picked on each other and not on the other fish in the tank.
It might work to have several rams in the tank (mostly females) to disperse the aggression but I've never tried that myself.