my electric bill in so-cal averages 50 a month the most has been 69 in the summer and i got a 300,210,125,110,60,55hex,2x40's,and a 10gal. all of them plug into the wall with more then one thing running.update your filters and heaters with new ones might help. my bill used to be 140+ sometime ago but i upgraded from fluval filters to rena. seemed to help me. i too am going to wet/dry a indoor pond soon or rubbermaid is also option. goodluck.