Found this a few days ago, any ideas? I used Kolsch ale yeast and fermented for about 2 weeks 4 days. Then I found the little round thing you see. After finding I cold crashed for 3 days. The picture is right before kegging it tonight, am taken from looking down the neck of the carboy.
Besides the circle (smaller than a pea) you see there was other little small things floating. After racking there was some film on the sides of the carboy.
I brewed another different batch using different yeast, which I also racked tonight and everything looks fine. Any ideas if this is a infection? If yes what type? And should I be worried for future batches?