Yeah, the krausen is a good sign that fermentation is happening. Since it's formed, your best COA is to seal it back up and forget about it for a bit. After it's been in for 12 days or so, take a hydrometer reading. Seal it back up and take another one 2 days later. At that point, they should both be the same. (i.e. really close to, if not at FG) Seal it back up and wait another week or so, then bottle.