I have seen this talked about before but can not seem to serch/find it. I was looking at my primary fermentor (Day 16) and it seems to have a oily look to the top layer of the beer/wort (whatever its called). Is this normal. I got my tap-a-draft in and was wondering if I should wait some more before racking to tap-a-draft. I am trying not to use a secondary this time, just to see if I can make good beer in primary.