I am pretty sure that I have electricity running through my water... Because everytime my hands are wet and I touch the water in my tank I get pain running threw my finger... I am pretty sure it's electricity because my new tank does not do it I know salt water burns cuts... And I do have cuts on my fingers.. But I also wet my fingers with tap water and the same thing happens.. my hands just have to be wet and I can touch the screen top of my fish tank or the filter floss or media baskets I get pain... Only on certain fingers. I have this power meter how do I use it heres a pics of it... They might be why fish dart at times for. No reason