I am an avid DB maker and so excited I bought a new carboy! BUT It is a 7 gallon carboy - not a 6 gallon. Can't return it as I bought it several hours away from my house. Any suggestions????
There is nothing magic about using a 6 gal carboy. Either increase the volume as suggested (not a bad idea BTW) or use as it is. A larger volume carboy will prevent (most) volcanoes! Always a fun occurrence! If you are concerned about headspace, don't worry . While fermenting, CO2 fills the space. And in the secondary, as long as no outside air enters, you should be good. I usually rack just before fermentation is done for this reason.