You realize you should of had your co2 plugged into the GFCI outlet along with the filter. Or for as many times as those GFCI outlets false trip, remove the GFCI and install standard outlet.
That would be ideal and is a good lesson for those that have setups that can accommodate that. In my case, the regulator is in the basement, so combining both into one GFCI is not possible (all tank apparatus are plugged into a UPS which, in turn, is plugged into an inline GFCI). For me, the lesson is to never power-up the filter, after being off for more than a half-hour or so, without bleeding-off the reactor contents. Many a fish gave up their lives to teach me this.