How much $ to run a fish tank?

[Friendlyfishies]

Im going to be moving into my friends house in a few months and have agreed to pay my fair share of the electricity when it comes to my fish tanks, but I have no clue what that might cost?

I have 2 10 gallon tanks, each have 2 6500k 10w bulbs that are turned on for 12 hours, a whisper filter and a heater (I dont remember the wattage).

Just an estimated guess based on your own electricity bill, what might I be looking at monthly?
Im thinking of saving up now before I start paying rent, then I can get a bit ahead of the game :)

[Shrimpsta]

About 3 dollars a month =]. For 1 tank. Would be cheaper if the room is not cold. I calculate it with a 50 watt heater. http://www.marinedepot.com/md_educat...lectrical.html

[Gryphon]

^+1

It's crazy cheap to run my tanks, almost nothing to blink at.