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Gfci and grounding probe are not related at all.Yes to both as I believe a GFCI is not that effective without a grounding probe.
For there to be a difference the current has to go somewhere or else its just circulating in the tank without killing fish(Bird on electrical wire), and possible can cause SPS or fish issues. and you'll feel it when you reach in the tank and become the way to the ground.Gfci senses current between the hot and neutral. The ground has nothing to do with it.
Gfci senses current between the hot and neutral. The ground has nothing to do with it.
Randy,
You are right in that the ground probe does not guarantee your safety. I don't use ground probes but if you must, the safe way is to mount them on a switch and turn them off when you are in the tank. That way you get the supposed benefits but you are not grounded when you are in the water and touch your light that is shorted.
I asked this before, would a Aqua-Via Titanium heater act like a ground probe?