Just to clarify... primary fermentation IS fermentation. Secondary fermentation is a misnomer of sorts. It is better (IMHO) termed conditioning. If the beer is racked to secondary (and this is a choice as you will see if you search this site), it should be done after fermentation has been completed and a stable FG has been reached. At that point, yeast is not producing more CO2. Any bubbling that you see during "secondary" should only be from dissolved CO2 escaping through the airlock.
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