I have a plastic 2 reel tank. On the bottom it say for one 35mm rolls 325cc/11oz. are needed and for 2 rolls 570cc/20oz. are needed. I am doing test runs with water blah blah blah and noticed that this amount of chemistry just barely reached to the top edge of the reel. My question is do the reels need to be completely covered with chemistry? When you are processing only one reel do you put the second blank reel in the tank?