Nicole...
How the heck could it be that low. I think my Hello Kitty nightlight costs more than that per month. 
I don't remember a bill < $100 since the 80's.
SteveU
Well, my "big" nano (15g) has:
65w PC running 14 hours per day
7w Tunze powerhead
6w HOB filter
50w digital titanium heater that probably hasn't kicked on once
650VA backup battery drawing trickle current
(I have roughly 30x turnover in this tank.)
The baby tank has (10g) has:
5w HOB filter
50w analog titanium heater that probably hasn't kicked on once
15w CF light fixture running 14 hours per day
(Low flow tank)
The other nano was a stock JBJ nanocube plus 50w analog titanium heater and 14 hour light cycle.
I have gas furnace, gas stove and gas dryer. Electric hot water heater, but it's new and very well insulated so it only kicks on once about every 12 hours unless I use hot water. I wash clothes in cold -- makes them last longer -- unless they are smelly or visibly dirty.
I don't watch TV unless maybe I throw in a DVD, and I use a multi-switch to totally power off electronic equipment, transformers and chargers when not in use. My laptop is not plugged in unless it is charging. I turn the lights off when I leave the room.
This spring I installed a very efficient AC and insulated well ($650); the AC lives at about 79F. Last winter I installed high-efficiency low-E dual panes windows and insulted well ($1100). This summer I purchased double cell cellular blinds ($550) with an R4+ rating.
When the temp outside is cooler than inside, I open the windows to suck in cool air, and close up the house before leaving on hot days.
My nightlights are all luminescent (~0.3 watts), outside lights are solar. That's it. A few items stay plugged in like the microwave and clock radio.
When I was running the big tank, my usage was 150kwh less in June 2006 (in the heat!) than last year's mild June. June 2006 was about 600 kwh; July will be... 250?