I'm an electrician and I have never heard of a combo breaker...Bathrooms by code have to have a GFCI while bedrooms have to be on an ARC fault breaker....An ARC fault breaker will not trip when their is voltage leaking to ground it will only trip when their is a all of a sudden increase in current kinda of like the same way a normal breaker trips but ARC faults are much more sensitive cause they use a MCU instead of a Bi-metalic strip!
It's odd to here that with absolutly nothing plugged in that their is 9 volts in your a aquarium, I am leading to believe that the meter is faulty...check it by putting it into a recepticle to make sure that you are indeed reading 120 Volts.
Once you've had 600 Volts surge through your body, 120 volts seems like child's play!!!
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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