Pico heater ideas?

[scubabum1983]

I decided to try a pico as i had money in had at the fish store (dangerous combo). Its my first small tank under 40 gal. So i set it up and love it,but am worried with the small water volume and temp fluctuations at my apartment that the pico may be getting too cold at night with the ac cranked. has anyone come up with a cool mini heater or some home devised contraption that can keep the temp stable?

 

[Kentanner11]

drsfostersmith have a heater less than 10$ that worked for me. I didnt have the same tank size you did but it took off the chill. IMO I honnestly think you will be fine, I dont have a heater in my 5g. tank, actually its alittle hot.