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Peep The Story Via TMZ

Mike "Situation" Sorrentino was busted at Boca Tanning Salon in Middletown, NJ ... according to law enforcement sources.

We're told cops got a 911 call reporting a "fist fight" inside the salon ... and when officers arrived -- Sitch was arrested, and eventually booked for simple assault. He posted $500 bail ... and on the way out he explained he and his bro, Frank were scrapping over how to run the business.