May want to find out how much stray voltage is running around in the tank as well. The grounding probe if you could put it in your display tank just in the event for some reason there is breaks in the water and the sump probe doesn't affect the display. Remember, it'll be AC voltage. Try with the lights on, off, and just for fun, unplug all other components to see if you can track down the one, it may or may not be the lights. Of course try to trip it with your power bars, as well. Sounds like an annoying Sunday!
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