So I was wondering if anyone here uses a grounding rod in their tanks? If not have you considered one? I'm thinking about it because I know I have some stray voltage. If my arm touches a grounded object while my hand is in the water, I sometimes get a little static shock. Only if the object is well grounded. (ie the shell of my light fixture) It's a tiny little shock but a shock none the less. I'm tempted to borrow my friends voltage meter and see if I can find out how much juice is going through.