After I racked to secondary I learned that I should've done this after purging the oxygen out of it. So consequently I racked straight to the carboy. But after doing so, it must have reinvigorated some of the yeast because my airlock has been bubbling pretty good ever since. So I'm guessing that means I have a good amount of CO2 built up in the carboy. That being said should I be worried about my beer becoming oxidized or is the air lock activity a good sign that I shouldn't have to worry about it? Info have a good bit of head space as my wort came up well short of 5 gallons. I ended up with about 4 in a 5 gallon carboy.