I'm about three weeks into brewing my first beer, and in the last week I've noticed the krausen ring has sort of "dropped" in to the beer. Like if I look at the side of the carboy, there's this floating ring just below the surface of the beer (and then a normal-looking ring about an inch above). Also, there seems to be quite a bit of floating debris in the beer that looks like krausen particulate. Is there anything I can do to filter it out? I considered cold-crashing the beer, but I don't have the space in my fridge and don't think the temp outside would be consistent enough. Any other suggestions would be great.