I brewed a IPA two weeks ago. Almost immediately it started bubbling like mad for 4 days. So much, in fact, it bubbled over a couple of times the first 24 hours. After four days, the bubbling came to a dramatic halt. However, the water in the air lock was pushed over to one side (I was trying to find a the pict Revvy posted a while back to show this but had no luck). In any case, I felt confident the CO2 was sitting happily above the beer and everything was normal. However, after a week I noticed the water in the airlock was going back the other side (towards the entrance of the carboy). Then a week later (currently) the water went back to exit side of the airlock and it began bubbling again. In summary, it fermentated, then resided, then started fermentating two weeks later. Is this normal? I can't read my hydrometer inside because the hops and bubbles of the beer.