Quote Originally Posted by spudz11
Don't totally agree with you... currents can be small and noticable, but not not lethal. This reminds me when i was at a store who's display case with flourescents inside were failing. I leaned on it and got a similar feeling, although that was much stronger, and still not lethal.

-Brian
More then likely you were grounded (rubber soles on your shoes)...had you been barefoot standing on a wet substrate (like your snake) you would have grounded yourself and got the crap shocked out of you.

Anyway...Sorry I didn't catch your other facts the first time so it is something different. Is your substrate wet? Only other ideas is maybe you are pinching one of the wires under the tank and getting a short that way.

Other than this I am out of ideas without seeing it....sorry I couldn't help