After saying the voltage won't ever say zero.. I tested my tank today and I got zero...
I just got a new skimmer so I think my old skimmer pump was putting out 10v in the water. New skimmer apparently drops nothing.
I also don't have any power heads in the tank because I have vortechs. The only thing in the water is my heater and skimmer pump.
Glad you found the culprit safely.
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