I can't find a thermostat anywhere. Not Walmart, not Menards. Maybe I'm not looking in the right place. Idk. So I'm going to have to drive almost an hour to Petsmart, but all they have is this : http://www.petsmart.com/product/inde...AvailInUS%2FNo

It says for tanks 40 gal. & up. Would it work fine on a smaller tank? Where are you guys finding yours? I have the option of Walmart, Menards & Petsmart anywhere near me. :/

Thank you!