Necessary? Not really but I always like a little insurance....... never hurts.
Took a trip with the family a week ago and when we came home one of my garage tanks was half full because our house sitter left the refrigerator open and it tripped the gfi. Pump wasn't on, but the sponge filter which is on another circuit altogether was chugging along with no issues.
Fish were fine although a bit cramped lol.
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