I may have some stray voltage running thru my tank. I have an auto ranging multimeter and set it on ACV then I put one probe into the grounding hole of my outlet and the other into the water. It was reading 12, then I turn off the pump and it read 7, then I turned off the skimmer and it dropped to almost 0. Am I doing this right? If I am should I be concerned with that much stray voltage? I just find it wierd that my return pump and my skimmer pump would be leaking.