ok fellas, i have started my blueberry mead and i used shop bought yeast nutrient rathe rthan using raisins like last time and a fruity yeast strand. its been 2 hours but now bubbling in the airlock. should i be concerned? my last batch was able to blow up a balloon within a minute of mixing all the ingredients. is using berries slower or is it the shop bought nutrient that takes time. i used 1 level tespoon which is about 1 gram which is what the packet said to use.