The GFCI didn't trip because you need a potential on the ground wire. If you added a grounding probe onto that GFCI I bet it would trip instantly.
It's coming from somewhere... something is adding that. I second the "unplug everything and add things one by one." It could even be your lights, I've had my GFCI trip based on excessive moisture in the hood and the lights would turn on and .. poof .. flatlined tank. I have a fan on 24/7 in the hood now just to keep any moisture from settling on the surfaces.
43V is WAY too much voltage IMO.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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