I had a couple of titanium heaters, that hook up to my controller, I keep get sting when I put my hand in there if my hand had a cut. I find out it was the titanium heater with the 3 prong(ground) plug. when I connect it to glass eheim(2 prongs) plug no sting. it is not my controller because I had connect the heater element to the outlet, still get sting. I thought it was a broken heating element, so I got new titanium heater Finnex, still the same problem, it could be a defect heat, but now I begin to think this is a titanium heating problem. this only happen with expose wound, intact skin nothing. anyone run into this problem