Im looking for a GOOD heater that i can use on my qt tank. The room it is in can have drastic temperature changes so i need a heater that can keep a steady temp. (work hard when it's cold but not over heat the tank when it warms back up) Someone said i should look into one with a controller like this:http://www.drsfostersmith.com/Produ...ge-_-Heaters&ref=3969&subref=AA&N=2004+113767 but they are aut of stock. any suggestions?