Wiring advice/help needed (voltage in tank)

[GoFish]

So im getting the feeling that the grounding probe does absolutely nothing to protect the fish corals and other tank inhabitants from harm, it only prevents me from getting zapped (to a certain extent). With the grounding probe present in the tank if I stood in a puddle with bare feet on a metal drain cover that was earth grounded it would make sense that I could possibly absorb enough current to get harmed (if there was actual current in the tank). The probe seems more like a comfort thing. I swear that with a grounding probe in the tank and voltage showing 4.0 volts from my first post I still felt a tingle in a cut on a finger, but not uncomfortable. For a fish to actually feel the current or voltage wouldn't it have to jump out of the water and give a ground probe a high five with its tail in the water?! I haven't honestly seen any difference in any livestock in the tank with the probe or without. It's like they are in their own little world no matter what. If I drop a toaster in the water while in the bath tub, before the breaker trips I'm most likely dead, period. However if I'm swimming In the ocean or in a really big swimming pool not touching the beach or the edge of the pool and someone threw a toaster in the water would I even feel it?

I'll talk to J+L where I bought the skimmer and see if this could be a warranty issue, it continuously gives high voltage readings (20ish volts)

Wildechild, it's interesting you get nearly the same reading I do, I wonder how many people on the forum would get voltage readings.
The tank is only 20 gallons BtW

Let there be a poll!

And back to something I previously mentioned. Is there any chance that my recent T5 light fixture issues caused my other equipment to do the same, leak voltage? If so maybe I should replace ALL my equipment at the same time, other wise I risk having the same thing snowball again...