My two guinea pig Boars are fighting?

My two boars are not really getting along. Teddy is about a year and was with two others til then passed away due to an illness. We got Squirrel, who is about 5ish months old, a few days after we lost two other males. We origanal kept them separated to make sure Squirrel or Teddy was not sick. After they met and a week went by we opened up the cage. They were fine and only showed normal behaviors. Then after a few month we had them in a plastic bin well I was cleaning the cage They stated to chatter their teeth and after a couple seconds they lunged at each other and became a whirlwind of fur. I seperated them and neither of them was hurt and no blood was drawn. We divided the cage again till the bigger one came in. Now we have them in a 10sq ft cage with a small loft. Plenty of room. However they are fighting again. They become a sorta whirlwind of guinea pig. This is the best way I can describe it. They dont draw blood and separate on their own. I am just worried if I cant step in they will hurt each other or I will wake up to a dead piggy. What can I do to stop them from fighting or is this normal? Will they work this out on their own?