The general consensus is that if you run a ground probe you MUST also run a GFCI otherwise you are actually putting yourself at GREATER risk by having a ground probe without a GFCI because nothing will trip to shut down the offending electrical component should it actually be leaking current (to you for example).
Also, the fish don't get zapped. They aren't grounded. The idea that stray current somehow causes HLLE has generally been dismissed as nonsense over the last few years.
Do a search on RC - this has been debated ad nauseum and when people who actually know what they are talking about (I'm certainly not one of them) get involved in the conversation the take home message becomes the same - if you run a grounding probe you must also run a GFCI for your safety.
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