For almost a week I had good fermentation off a D47 yeast starter. Now I have little air lock activity. When I swirl the bucket I get a little action that lasts a few minutes, but then returns to the slow state. I am thinking about pitching D47 again, and a little nutrient+energizer to get fermentation going again. I might just be paranoid, but I want to get the most from my investment. Do you think this is a good way to get it going again? How long should I have vigerous fermentation? I was thinking that it should give me consistant airlock activity for 2 weeks or so, but this is my first mead and I just don't know. What should I expect?