OK. I have a grounding probe on my system. but its located outside in the sump on a seperate circuit from the items that are inside the tank itself (Koralias). All circuits used for the tank are GFCI. Does it still protect the entire system? (heaters are in the sump on same gfci as the probe)
any way we put it, stray voltage is bad and the source should be found and removed.
any way we put it, stray voltage is bad and the source should be found and removed.

