i attempted to hook up my Mp40qd tonight. I placed dry side where I wanted it. Placed wet side to dry side. Plugged it in and the wet side fell to bottom of tank. I picked it up and attempted to hook them both up again. Again it did the same thing. I inspected the wet side and I tired to turn the fans but they seemed to be stuck. I applied little pressure to the back and it freeded up whatever it was. Fans now would spin freely. I attempted to hook up again this time outside the tank. It did nothing. Took wet side off dry side and yup stuck again. Is there something I am doing wrong?