A quick question. I started a batch on Saturday with an airlock on a 6 gallon carboy. The fermentation was so vigorous that the foam started invading the airlock Sunday evening, so I switched to a blowoff tube, which was still bubbling this morning. My question is, should I switch back to the airlock once the fermentation calms down a little? And if so, when? Too soon, and I'll have to switch back, too late and I guess I could oxidize the beer if it's not producing enough CO2 to force out any air that gets in there during the switch. It would be easier to move with the airlock, though I'm not planning on moving it until bottling day so I guess that's not much of an issue. I'm sure this question has been asked before but I'm not sure how to search past forum posts.