I have a nuvo 20 pro that sits on an aquarium stand and the leveling mat innovative marine sells with it. My display water level is off. I measured it and one side is 1 inch versus the other side being 1 inch and 1/4. I put a level to the tank and stand and all seems level. Is there something going on with my return that one side is being sucked through the overflow faster ? Does anyone have the same issue with this tank ?