Electrical question

[Black Phantom]

By code you have to have a GFCI in your bathroom in case you drop your hair dryer into the sink full of water. Or reach into the water when holding your hair dryer.
Obviously there is no ground probe in your sink. Isn't it the same thing with your aquarium?
I'm really in the dark here and just don't want to find myself floating over my lifeless body on my way to who knows where

Hopefully up