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cczarnik...sorry about your tank being fried! i had a heater's remote thermostat short out on me. i didn't have a grounding probe but luckily i was home and heard the sparking and could unplug it before it killed everything or crack my sump. the water
smelled like burnt plastic for about 4-5 days.
One good piece of advice I got from this guys article is to make everything external. That would eliminate the need for a probe and the risk of loosing all power. Although he mentioned using an internal heater there are in-line heaters that should work.
So the addition of a grounding probe will cause the GFI switch to trip when a short occurs, killing the power to the system on that switch, assuming it is grounded somewhere other than the GFI plug. Correct? Hopefully I am home if this ever happens or else the tank with go without power putting the livestock in jeopardy.
IMO...make everything in your system external as the article suggestest and use a probe.
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