It`s unusual for Shamos to fight seriously at that age. It`s usually Asils that do that. However, it sounds like you have them in a brooder, sooo, I would make a small barrier out of something like hardware cloth and section off room for both of the troublemakers, near the light so they can share the warmth. You probably will find that only one is the aggressor and the other is the defender, in which case the aggressor will continue to pick on another and then another. He`s the one that needs to be alone. Later on, more aggression may start with others and they will need their own pen. It`s not as hard when they have feathers. I once had a big pen that was called the tic tac toe pen. It was 3 levels of 3 pens that were 30" x 30". That`s where I put all my aggressors, as well as broody hens and injured birds. Sometimes, if space is not an issue, you can put them in a large roomy pen with a mature cock to police the action. The idea is "if anyone is gonna kick butt around here, it`s gonna be me". That usually works until they are about 8 months old when they begin to "turn on", after which all the stags must be penned alone. If you aren`t prepared for this, you will have a huge problem. Julia Keeling, "The Shamo Lady", says in her book that Shamo stags are "big puddings" until they reach that age. There are exceptions, of course. Oriental gamefowl are not for the faint of heart......Pop
BTW: chick fighting is normal, even in regular barnyard breeds, which Shamos are not. Don`t be alarmed unless damage is being done and blood aprears. You have to watch them constantly. It`s the time when you go off to town for a couple hours that will produce the carnage.
