Jay Hemdal
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Figured it out. Stray electricity through the tank.
Just to clarify the terminology - "stray voltage", also called induced voltage, is harmless to fish. When you see a burnt plug like that, you have a more serious electrical issue, and short circuits can harm fish (as well as poeple!).
The reason this distinction is important is other people read it and start to blame stray/induced voltage on any of their unknown fish losses, and that just isn't the case.
Jay