The ground probe is there to help the GFCI operate, the GFCI is the safety device and is the most important part of the safe aquarium.
The GFCI will work alone without the ground probe, however the ground probe alone without the GFCI is more dangerous than having nothing. The danger in electricity is when you become its path of least resistance to ground.
THE GFCI IS THE MOST IMPORTANT PART!
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