Hi all. Brewed this Kolsch up two weeks ago tomorrow. I used the Wyeast 2565. I thought initially fermentation didn't seem real vigorous like some of my other extract brews. This was my first attempt at a liquid yeast...didn't make a starter. Temp in my crawl space was between 58 and 61 degrees, right in the optimum range. Just looked at it for the first time in a couple of days and there's still a good, thick layer of krausen at the top of the carboy, but the bubbling has pretty much stopped. I'll take a gravity reading, but I was just confused by the layer of foam at the top. I would think by two weeks this would have fallen back into the beer like all my other brews have (granted, I've only done 5 or 6). Any thoughts? I'm afraid to pop the airlock off and take a reading with that krausen.