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I use the Hagen Marina mini submersible 25 watt heater. You can set it and it has a indicator light. I have mine set at about 76 F.
http://www.petmountain.com/product/aquarium-heaters/11442-511330/hagen-marina-marina-mini-submersible-aquarium-heater.html
http://www.petmountain.com/product/aquarium-heaters/11442-511330/hagen-marina-marina-mini-submersible-aquarium-heater.html