I'm thinking of trying a Mosti Mondiale’s 23L Original Alljuice Kit. 23L works out to 6.07 gallons. Do I need a 6.5 gallon carboy or will a 6 gallon one work? I have suspected the 6 gallon carboys hold slightly more than 6 gallons. I haven't measured them other than when I fill my fermenting bucket and subsequently pour the wine into the carboy.