I brewed a batch of hefeweizen on Saturday. Pitched about 8:00pm. By Sunday morning it was bubbling in the airlock. Yesterday it was bubbling really good. Now, nothing. I watched it for 10 minutes and didn't see a single bubble. It's been less than 48 hours and it's already stopped bubbling. Is the fermentation stuck? If it is, what could I do about it? I would add that this was my first time using a dry yeast, safbrew WB-06.