I have one of those multi meters, so thought I would test my tanks, just in case. And to my surprise, my refugium tank has stray voltage. The needle moved quite a bit.
Turns out it is my T8 light fixture sitting on top of my lexan tank cover. There is a bit of salt creep around the fixture, so will have to see what I need to do to fix the problem. Still surprised how that gets into the water. But when I shut it off, the stray voltage is gone, so that is definitely the source.
Thank goodness, my display tank and sump checked out OK. I have a lot of pumps and electrical devices in and around them.
Glad I read this thread, or never would have thought of checking.
Canreef rocks!
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