i had a pellicle form on top of my first attempt at acv. it was said to be beneficial for the process. but i threw it away when i was straining out the solids and moving to the aerobic stage turning alcohol to vinegar. at this 2nd stage, a 2nd pellicle appeared. this time i decided to keep it as advised. so please help me understand... if the 2nd stage is aerobic, won't that pellicle act as a barrier to oxygen, and be counter-productive?