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I assume you ruled out bubbles and that the top off hose is not near the optic sensor as it is a source of bubbles from the incoming water. If those check out (you tried the bubble test I described of wiping your finger under the sensor when in the act of overfilling). I think the best step is we send a new optic sensor, PM me your address.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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