It doesn't take much current to kill (fractions of an amp) and getting a tingle isn't normal.
Should get a GFI and a ground probe as you found all can basically look normal but still have the potential to cause harm. That way in the future when something does start to fail the indicator will be the GFI tripping rather than you flopping on the floor.
To find the device causing the problem, suggest with a GFI and ground probe, unplug everything, then start plugging back in one at a time. What trips will be the device that's leaking the current.
As for the argument that what if I'm away and the GFI trips and the tank crashes. Well, in my case believe (at least pretty sure) the wife would rather the tank crash than me dead.
I've got multi GFI circuits with the idea if I get something like a little salt creep on the lights, it won't take out all the pumps, if the sump return fails, the CL is on another etc.
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