I've got a couple questions for you if you feel up to it.
The "best practice" discussion on this topic is usually full of theory and conjecture so I bet we'd all like to know more about your setup.
Did you have the tank on a GFCI plug?
Did you have a ground probe?
I'm not really sure either of these devices could have completely avoided this but I'm curious if you used them. Sorry to hear about it, I'd be pretty upset if I were you.
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