This past Saturday I brewed an all grain recipe for a Dunkelwiezen. My brother-in-law helped me out as he is much more experienced than I am. He thought it would be good to use the fast pitch yeast starter so he threw it together and had it going to town on the stir plate while we brewed. All seemed well, the crausen started by the next morning and I was excited to see how it was going to progress. By late Sunday, the crausen went away and the beer just looks stagnant. The picture on the left is Sunday morning and the picture on the right I took now. To make my angst even worse, we also brewed an extract batch and that yeast is still going strong today and we didn't use a starter on that one. Can I pitch some more yeast or should I just let it ride and see what happens?