"Stephen" wrote in message ...
Right, Especially on concrete! (Giant solid gelatin).... But what about
wood flooring or Carpet? The majority of aquarium devices do not include
grounds in their cords. However they really should. A ground probe provides
a positive ground to the tank to trip the GFCI immediately in case of a
problem. It is just an added safety measure. However, like you I believe the
other stuff is hocus pocus snake oil.....

This "added safety measure" is not needed. That is my point exactly.
If there is no current flow enough to trip GFCI there is also not
enough current flow to electrocute you. Do you agree on this matter?

And, when you add grounding probe you are CAUSING current flows from
a faulty device to the ground through the water column. GFCI are not
designed to trip on current levels which stress your fish, so such
currents can flow to the grounding probe unstopped. That is the reason
I am strongly against the grounding probe as a cure to the faulty device
leaking some electricity to the water. In the value range from 0-5mA
GFCI will not react, so such currents as 5mA could flow from the faulty
device to the ground with a help of this probe.

However, after saying that, imagine the fact that the entire tank
essentially becomes a Faraday Cage once the ground it inserted.

I disagree. This is not a very good analogy. Situation in the fish
tank is far more complicated. I would say that fish body resistance
to the AC current is comparable to the salt water resistance so you
cannot neglect currents flowing through the fish body in the calculation.
The body of any living thing is full of electrolytes conducting
electricity very well.

More physics than I would like to think about this early.
I am sure that a book could be
written about this subject if studied in a lab. Only then would such
discussions be resolved. Until then this is just opinion versus opinion....

I see you are not willing to challenge my scenarios with GFCI, ok :-)