Thing is, its not the items "leaking" voltage into the water, its more Inducing. See, Electyricity can be transmitted without contact. Electricity flowing through a conductor creates a magnetic field. A magnetic field that moves near a conductor will Induce electricity in said conductor. Its how most all AC motors work. Now, we all know that SW is very conductive. I would bet you'll see electricity in the worlds oceans too. because the world is one HUGE magnet, and the oceans flow through this magnetic field.
Now, as far as shocking you, the induced voltage is only in the water, and thus referenced to the water. it shouldnt shock you. This os not to say you cant get shocked, because if a piece of equip IS malfunctioning, then its possible. See, the electricity in your Wall is referenced to earth. meaning, the ground pin, AND the Neutral are tied to a point that contacts the ground. This means that anywhere the HOT will have potential to ground. We stand on the ground, so therefore usually are at Ground potential.
How did you measure the voltage in your tank? was it from water TO ground? or did you just plop both meter leads into the water? Water to ground=BAD
water to water=ok
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