So - my second batch is coming on two weeks now. There was good airlock bubble for about a week - and then it stopped. When I opened the lid to check gravity - there isn't the tell tale "crust" along the outside of the bucket. This is only my second batch so I am not sure if that means I screwed it up or not. Any suggestions? Don't really want to go through the trouble of bottling if I screwed up the fermentation. Tks!