If you've kept the entire thing sealed up during the whole fermentation, everything in the carboy is good stuff. That ring at the top is generally composed partially of hops, and it is extremely bitter, but if you go through an entire second fermentation, everything will settle back out, either at the top in a new ring, or settled into the trub at the bottom. Just keep everything sanitary and you'll be fine. I'm going to be doing the same thing in a week or so.
WORLD DOMINATION BEER
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