Whenever I do a water change, I take my entire system offline. Just now I did almost an exact amount of water out and then back in and my optic eye sensor was submersed a little past the point of where it should kick on and pump water in. Whenever I turn on the ATO, it automatically dumps water into the tank for atleast 15-20 seconds causing my tank level to be higher then I would like it to be. Does anyone else have this problem or is there something wrong with my eye? Other than this issue, everything else works flawless, it's just when I have the tank offline and then it gets plugged back it this happens. Thanks!