another option is to run a couple of GFIC circuits and the ground probe, only the one with the problem will trip if something goes wrong. i have 4 different GFIC's in my setup, just for this reason. also many recommend not plugging your main pump into a GFIC, this can be dangerous but not so much if you have a ground probe in the sump.
just some thoughts......
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120S RR tank with 60G basement sump / fuge
Return Pump: Little Giant 4-MDQX SC
Water Movement: Seio 1500, (2) Hydor Koralia 4's
Lighting: 400W SE MH with 14K Aqua Connect
Skimmer: Euro-Reef RS250 with gate valve
Other: RODI, RDSB, PO4 / AC reactor
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