I've been brewing for about two years, and this is the first time this has ever happened. My beer has been fermenting in the closet, like usual. The fermentation seemed to be relatively normal, although I wasn't checking in every day. I had a busy couple of weeks, so it's been about a month since brew day. I go to pull it out to get ready for bottling tomorrow, and it's separated into two layers, a milky layer on the top and what looks like beer on the bottom. Does anyone know what the hell this is, and whether it's ruined?