I would suggest a Jager heater and i use a Apex JR for controlling temp. The apex is awesome. I have a small fan hooked up to cool the tank too! Neat stuff.
By the time you spend 50-60 bucks on a temp controller you could look for a used AC JR, apex jr, Reef Keeper Lite, or new apex jr/reef keeper lite and then not only controlled your temps you could control your whole tank.
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