Ok, I'm no electronics guy, but if there was a short in the tank and the water is "live"' wouldn't the fish be dead first, before you get shocked?

I don't know squat about it either, but I do know the fish just swam around laughing at me every time I've zapped myself :)

What are you trying to say here?

Just to be clear all electricity affects the human body and the heart and can kill you.

Please use ground fault circuit interrupters on your aquariums!

No it does not kill the fish unless they reach out and touch the ground.

I'm not 100% but I think it's because the fish are not grounded however they are irritated by excess current in the tank.

Sorry man this is simply not true, one Ground Fault Circuit Interrupter (GFCI) can detect faults in several things. You do not require a GFCI for each device.

There is no current in the tank until the human does something stupid, like putting his hand in the tank or any other "grounded" device such as a ground probe!

The current in the tank comes from a faulty device such as a shorted powerhead it grounds on itself until the stupid human stick his hand in the tank to grab the powerhead without unplugging it first.

Ok where to start...... If the power head was truely shorted, the current would have exceeded the rating of the over current device, usually being the circuit breaker, therefore the breaker would trip and there could be no current.
Current can not flow or exist unless it has a path to flow on, therefore current cannot be waiting in the tank. Current is the result of voltage on electric circuit.

Please refrain from giving advise to others on a public forum on topics that you have limited understanding and knowledge on.

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