I'm thinking about these big 5 reel tanks. I want to start C41 processing and the idea of developing 5 rolls at once appeals. Does anyone use one of the 5 reel tanks? I'm concerned about the time it takes to fill them with chemicals and time it takes to empty them. The C41 process is short, would a 5 reel tank imply that the bottom films get over developed or the top ones underdeveloped? I'd like to hear any thoughts.