When I first started leaving Mickey and Max alone at home together, I put Mickey in the exercise pen. That way they were together alone but not together.
Then I started leaving them both out for short times until it became anytime I was away.
The little "tiffs" are normal. My boys do it all the time. I only get involved when it gets obviously too rough.
Mickey and Max had a period of time when Mickey was smaller that they slept curled up together. Now they just sleep on the same couch sometimes
Anyway, they will be fine.