[Myanth]

Glad to hear all is well.

I had a glass 300W heater break on me. With no grounding probe, it stayed that way for what I can estimate to be two days, until I zapped myself when doing a water change. No ill-effects to the tank at all. Other that a small heat mark on the bottom of my rubbermaid sump.

It probably is contaminant related rather than electricity.

My heater smelled terrible but it had brittle stars inside of it when I unplugged it. They didn't seem to mind.

As far as I know, which isn't far, electricity will not affect any living creature unless it is in the path to ground. As good a conductor as tissue is, it's not as good as water. I gave the electricity a path to ground out the back of my arm to the grounded light shade. Ouch. Until that point it was surrounded by insulators and was just shorting to itself. No breaker trip either.

Just a sore arm.

Might want to test for copper. It would give you a good idea of what you are up against.

Mike