I have a stout, fortified with 3 cups of cold-press espresso roast coffee and two vanilla beans in the secondary. It has been 10 days at 67 degrees and I went in to look at it today. There is an oily residue on the top, that I thought might be oils from the coffee, but there is also a more solid, multi-colored mold-looking substance covering part of the beer. I tried to take a photo, but it does not show up as anything.
This leads me to two questions:
1. Has anyone else ever seen this?
2. Is my beer ruined, or should I just leave the trub and the top in the secondary on brewing day?