I personally would worry, looks like a pellicle forming. Judging by the pictures, it looks like you have too much headspace in the carboy. It's important to use appropriately sized carboys when bulk storing cider long term, fill them right to the top. Cider films are aerobic, so minimizing air contact is important.
As soon as possible, rack out from under the film (leaving it behind) into a smaller carboy. If you plan to age it more, consider adding 100ppm of sulfites to protect the cider even more. Alternatively, bottle the cider now and pasteurize it to kill off the microbes.