I'm a newbie to home brewing. I have 2-5 gal extract brews and 2-1 gal extract brews under my belt; so, I still have a lot to learn. My third extract kit is a 5 gal milk stout and it's in the last stages of secondary - I plan to bottle tomorrow. The middle of last week, 8 days ago, I added vodka soaked cocoa nibs, cinnamon stick, and a vanilla bean to the secondary. I soaked them in 12 ounces of vodka for about 4 days and then dumped the whole lot in. That amount of vodka should raise my ABV by almost 1% and bring my final ABV to around 5.2%. I noticed a few days ago that there was something floating on the surface. I immediately thought they were fuzzies and that I had an infection. However, when I shook the carboy a little the clusters separated into what appears to be fine lacing. Then, most of them went away. They did come back a couple days later. What's going on in there? I'm wondering, were there some fermentables in the cocoa nib concoction and I'm seeing tiny CO2 bubbles from that? Or something else altogether?