im not exactly sure how electric devices leak voltage into an aquarium. I like using the water analogy, it makes a bit more sense to me. measuring voltage is just measuring a difference between 2 points, just like measuring pressure inside a pipe. its a comparison between the pressure inside the pipe and outside the pipe. adding a ground probe is like drilling a hole in the pipe. if it is static electricity that is giving you the voltage, the voltage will equalize and there will be no current after it does as there is no further source of voltage. but if its a powerhead that is leaking voltage into the tank, going back to the water analogy, its like having a pump applying the pressure inside the pipe. when you drill the hole water will flow out of the hole constantly until the pump is shut off.
It would be difficult to answer whether or not it would be enough current on the ground probe to trip a GFCI. but if it doesnt to begin with, if a heater or powerhead fails and leaks more voltage into the tank, it could in the future. As far as im concerned, a ground probe is a band aid for an underlying problem.
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