I spent 12 yrs as a fresh water guy and one thing I did every few weeks was to check any wire that went into the tank this stemmed from an incident I had a fully submersible heater and I had the protective covering over the wire crack after about 2 yrs into its use and when I stuck my hand into the water I had a communion with the big guy upstairs.
Ever since then I check all wires and equipment regularly. GFIs and power bars are good investments however a GFI will only help if it detects current coming from one item so plugging a GFI into a power bar does you no good you have to use a GFI for each piece of equipment you plug in however that being said I have seen GFI power bars but know little about them aside from that they are flipping expensive
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