I imagine the jolt is just a slight tingling, and happens repetitively and continouosly as long as you remain in contact with the surface of the water? An d not something that just happens and then does away. Are you barefoot or socks when this happens? its strange. its only when i touch the knuckle of my right pinkie to the water (
) do i get a zap, and then its just like a shock on a doorknob. its not continuous or pulsing. also, i am barefoot when it occurrs, but it also happened when i was wearing shoes with rubber soles.
The concrete is a earth connection. It is in fact not a great conductor, but an excellent ground connection. Don't get me wrong concrete conducts well enough, but just not the best we have. I cant tell you the actual conuctivity of concrete at this moment........well, I digress. Anyways, it's not likely a static source, that requires friction, your carpet is a good source of static electricity, but not a relatively smooth surface like concrete. So, if the jolt you are feeling is a tingle or even a good zap that occurs every time you touch the surface and are bare footed, then you have a problem somewhere. I should mention it can be when you touch another object that is grounded as well. Now, you say you disconnected EVERYTHING. Are you absolutely sure it was everything and all at one time, not just one thing at a time. well i turned the powerstrip off, which everything is plugged into. i didnt think to unplug the strip, but i didnt think it mattered (doh?) So the tank is completely disconnected from any source. And it still occurs. Try connecting everything up through a GFCI. Plug therm in one thing at a time, and see if anything trips it. If any one object does, remove that object and repair or replace it immediately. NOW, if you have a ballast with a capacitor on it and it is disconnected from the source, you can still get a shock, and a dandy one too if I might say so. Capacitors store energy, then release it when needed to perform a certain task. If it is a capacitor replace it immediately.
If you still have an issue, with everything disconnected, you may have an issue somewhere else and the water is carrying the current through the house piping and the point at which it can find a path to ground is between your fish tank and your concrete floor. So this could be a issue with your home. Try the above first, with the gfi and see what happens.
I will add that IMO, using a gfi on an aquarium is a great safety measure. If you have a ground probe or not, it's better than nothing at all. However having a ground probe without a GFCI is NOT a good idea. Ultimately a GFCI and ground probe both would be best
ohk ill try the grounding probe gfci thing... you kind of lost me with the ballast / capacitor / technical stuff thing but i get the main idea. thanks.