I have a christmas ale in a secondary fermentor, glass carboy. There is an off white foam that has been slowly forming at the top of the liquid over the last couple days. I added 2 tsp of cinnamon to the secondary before I racked the beer into it the carboy. I plan to bottle in 3 days. Is this foam an issue or just normal business? This is my first secondary fermentation. Also there are still bubbles coming through the airlock at a slow rate. Less than one per minute. I would appreciate any help.