I checked on here to see if maybe this topic wasn't addressed, I don't think it was. I tried my hand at my first (extract) stout. I did a starter and after a few hours it was literally blowing the top off my flask. I had about 1700ml of liquid in a 2l flask. I put a blowoff on that and then cold crashed and decanted. I brewed this past sunday and by monday morning ferm was going great. Worried about the same problem I quickly switched out to a blowoff tube. Now ferm has slowed to a crawl and I took a quick peek in the fermenter and it looks like the krausen has settled and ferm is almost completely done. The airlock maybe bubbles every minute. Am i worrying over nothing? I've just never had a batch that has gone through it this quickly. I know temperature isn't a problem as my basement has been in optimal conditions all week.