Welcome to Pet Talk Embyr, sorry I haven't seen this thread until now.
I have two gerbils who are sisters and they sleep together and cuddle but they do have wrestling matches from time to time.
Usually it is food that they fight over so if I give them a treat, I make sure that they have two of them so they don't fight.
As long as your gerbils aren't actually hurting each other, then they should be ok.
Some squeaks are normal when they play, it's pretty normal gerbil behavior.