Does anyone have any experience with the Tunze Osmolator Universal 3155 Auto Top Off? I just set mine up a while ago, followed the instructions and since its in a Biocube, it has the compartments, and so I put the sensor on one magnet, and the float switch on another and positioned that one further up so the alarm didn't sound if the return shut off. Well ,it pumped about a gallon of fresh water into the tank, way higher than it should have. After that, I put them on the same magnet and now it still fills it well above the sensor and only seems to shut off when the float switch shuts it off. Anyone have any ideas? Thanks.