I got the True Brew Oktoberfest kit, spent 9 days on the primary then transferred to carboy for secondary. It has been in carboy for 6 days and today I noticed these white circles of bubbles floating on top. They do not look like mold, they are pure white and seem to be made up of just bubbles. Is this CO2 floating to the top or maybe yeast? I'm attaching some pictures, the red spots on top is a reflection of the light on my fan. I'm new at this, I know patience is important when brewing beer, just hope I did not infect my first batch!