Electrical – How to add a GFCI receptacle on a circuit with split receptacles

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I have a typically wired living room with all receptacles switchable on the top outlet. We are installing a large fish tank and decided to add GFCI protection. I'm trying to change a single duplex to a GFCI + single duplex. I would like this box for the fish tank to be hot at all times. I tied together the switchable lead in this box so everything downstream is still the same. I fed the hot circuit through the GFCI and jumped to the neighboring duplex. You see where this is going? I didn't until I flipped the light switch. Shared neutral returning current not seen leaving the GFCI. Is there a way around this without pulling wire? Or do I have to live with switchable top outlets in this box?

Best Answer

Short answer, pigtail the GFCI on both hot and neutral side. Do not attempt to daisychain any other outlets off the "load" side of the GFCI.