if you read 0 and there is no other path to ground (maybe try disconnecting the usb to your computer before testing if you havent tried that already), then it wouldnt be stray voltage.
You seem to know more than i assumed about electricity. I am a 4th year electrician and i find a lot of people, not just in the aquarium hobby, that dont know much about it. looks like youve got your bases covered. if you test in the future, you could use your ground probe out of the water as a point to measure voltage from.
about the gfi, i dont use them because i know how sensitive they can be. to the point of being over sensitive. It only takes 6mA of current difference between the hot and neutral for a gfi to trip. i like the peace of mind knowing that it wont trip and take out my whole systems power when i leave for the day. next setup i do though will have redundant return pumps on 2 different circuits that will be gfi protected.
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