I'm brewing a basic bitter and using wlp002. Made a starter. Fermented at 64°F and raised to 68°F after the ferment slowed. I'm at 7 days now. The krausen has fallen but there is a thin layer floating on top. Nothing abnormal there. What's different is when I look from the side I see what look like little strings hanging down from the top. They only extend down about 3/4 of an inch. I've never seen this before with a other yeast and this is the first time using wlp002. Is this normal? Do I have an infection? I can't seem to find much. All the infections I read about seem to float on the top. These ones hang down from the top into the beer. Any ideas? Thanks!