I have 5 gallons of a Cascadian Dark Ale fermenting with this strain of yeast. I decided to ferment at 68 degrees but my mine concern is should the ambient air temperature be at 68 degrees or should the fermenting beer be at 68 degrees? I understand that while fermentation is happening, the temp inside the carboy could be about 10 degrees above ambient air temp. Could someone clarify what a good ambient air temperature is? Much appreciated.