hmmm I would suggest looking at your output rate on those outlets that the tank is plugged into. You can get smart plugs on amazon from the brand KASA and on your phone you can literally view the output of what your tank is consuming in electricity but my hinkering is that something else in your home is consuming that extra $$ also inflation is a b***.. I live in LA and my normal bill rate is 275-300$ monthly with running a 100gal reef with UV, skimmer, 200w heater, 2 wave pumps, carbon reactor, GFO reactor, reef dose & three Reef LED90’s.