I am a new homebrewer. On all my other batches I have noticed small bubbles (co2 I assume) on the surface of my beer in the 2nd fermentator. On this batch of IPA I do not see any at all. I had great vigorous bubbling in the Primary and my gravity also suggests that fermentation went well. Temps were always between 65-70F. However I am worried that the yeast are inactive or dead. If the yeast are dead will I need to add more before bottling to get carbonation?