I started a batch of a cream ale and pitched my yeast saturday evening. It took a while to start fermenting (2 days rather than the 12 hours I normally see) and didn't ferment with the normal vigor. I used a brewvint yeast fuel too. This morning i checked it and there is nothing. The bobbing part in the air lock isn't even elevated any more. I used white lab yeast. I didn't think the fermentation would be done by now. Any ideas? Should I go pick up more yeast aqnd try pitching it, or is this batch dead? thanks.