[McClary’s Electrical]

My first question was: Is this a 10uA problem or a 20A problem?

A gfi will not trip on overcurrent.

 

[McClary’s Electrical]

I wanted to simply bypass the GFI to see if the 20A breaker would trip but feared I'd electrocute thousands of dollars worth of fish if there was a flooded light.

?

The fish would have been fine. Ever heard of a farraday cage?