I have a Jobo CPE 2 with lift, and got a 1500 tank with it and it worked fine, but I also decided to get 2 2500 tanks (one small and one big). and to fit it to the machine I did what I read of turning the rollers round so they point outwards and still attached the tank to the bottom hole (I've heard of people not moving the rollers and using the upper hole but it wouldn't rest on the rollers [is this where I am going wrong]). When the wheel of the back of the machine sits in the water it rubs on the back of the main tank. So when I put the film tank on it doesn't turn as smoothly as it should. I was wondering why my machine is like this as I have read these machines are compatible with these tanks. What should I do?