This is probably a question that has been asked to death but here I go anyway. I started my first brew Sunday, a 2.5 Gallon full wort boil partial grain/extract DIPA. The recipe says to wait for fermentation to end, let it sit on yeast for one day then rack to secondary for dry hop. My question is should I do what the recipe says or just throw the dry hop in the primary after fermentation is complete? I have a 3 gallon glass carboy but will the 1/2 gallon head room be to much space and oxidize my beer?