i went to adjust my float switch and i felt a jolt!! it was weird.. i had a cut on my hand and that is where i felt it... i stuck my hand in one or two more times to be sure and it kept doing it.. i unplugged my powerhead and tried it and it shocked me again.. i unplugged my heater and it stopped..it hasn't done it since i unplugged the heater.. i obviously have stray voltage... do i need to get a new heater or a ground probe???