what heater?

I use two of these with pretty good success. I had one fail after 3 years.

I like it because its titanium.....doesnt break and there is an external controller.
 
There is no such thing as a high quality aquarium heater :)

For a display tank, you really need to be running a temp controller.

For a QT it would not be a bad idea either. If that is not an option, then you want to get the smallest heaters possible. Use 2 of them to heat the tank. Size them so that a single heater can not quickly overheat the tank if it sticks on.

I guess the first question should be... how big is your QT tank?
 
thanks for the help guys! what is a temp controller? I am not familliar with that. My 2 qt tanks are 25 gallon high tanks.
 
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