I recently set up my keezer and have already force carbed one beer on it and then just left it on about 12 PSI. I'm going to be brewing another beer tomorrow and I wondering how carbing works when I've already got another keg hooked up. Is it best to just keep it at 12 PSI and wait the two weeks or so it would take to equalise in the keg for the new beer? Or should I disconnect the other keg, force carb the new beer and then hook them both back up at 12 PSI?