Originally Posted by JJ-MIK
Red in the water of course. And the black in all 3 prongs. Start with the ground... No reading. Then in the small prong I'm getting 100v.. And in the big prong I'm reading 14.4.
If you have a stray voltage, the reading between the water (red probe) and the ground (black probe) must not be 0V. If that's the case then there is no stray voltage and you will not feel anything with 0v between the water and the ground (round prong) or where you are standing. Otherwise, you were getting a false reading. Anyway, in a saltwater tank it is very common to have this stray voltage if you have pumps with flat electrical cords. The insulation of these flat cheap cords are not that good. However, there are pumps with motors outside the tank isolated from the water but they are expensive.