Occasionally my ATK sensor gets crap on it and thinks it's full even though water isn't what's making the switch. I always wipe it off and it is fine. Has anyone written an alarm for if the ATK doesn't call for water for X hours of time? I want to steal your code if so. Now that I have a few decent SPS taking off for me I was really concerned to see my sump a couple inches low. I record my ATK running and it hadn't run for 20 hours, so I was thinking an alarm that said ATK didn't call for water, or that the lower sensor didn't come open for 5 hours. Looking forward to seeing what any of you have done!