Mike "The Situation" Sorrentino was arrested on Tuesday.
Sources tell TMZ the brawl was between Mike and his brother Frank.
The reality star posted $500 bail and is expected to be released later in the day.
Mike and his family own the tanning salon where the fight took place.
Reportedly, the paychecks the Sorrentinos gave them bounced, and each person was owed $100 to $200.
Mike is said to have attributed the problem as "an innocent mix-up" when "the store changed payroll companies."