Ok, so I finally received a voltage meter and I'm getting a reading of anywhere between 9-14 mA (I believe that's the correct unit). Adding the grounding probe takes it to 0.00. What is interesting, however, is that the reading is not effected by unplugging any piece of equipment in my tank. Is there something I'm missing on finding out what might be causing the stray voltage besides just unplugging each piece of equipment and rechecking the reading? And would this kind of voltage be considered deadly?