I am planning on taking a swing at this recipe this weekend. I have one question, I am using a 6.5 g carboy as my primary and wonndered how much head space I will need for all the lively yeast activity. To be more specific if I were to make this a 6 gallon batch would the .5 gallon head space be enough? or if I make the 4 gallon batch is 2.5 g too much head space, does it matter?
Thanks for the replies.