I brewed up my first lager this past saturday. by sunday night I had a good amount of airlock activity. I have it fermenting at 48* in a temp controlled fridge. anyway on tuesday it was bubbling about every three seconds. I checked it last night and now I get a bubble every 10 seconds. significantly slower. now I know the real answer is going to be take a hydro reading which I plan on doing tonight. but the suspense is killing me! should I be concerned about this significant drop in activity on day 4 of fermentation? I am limited to a bucket for primary right now so I can't see what's happening. anyway, do u think I'm ok?