im looking for a good heater for a 55 gallon tank. the one i have now i set for 78 degrees but it keeps climbing to 81 before i have to turn it off. any suggestion would be appreciated. thank you

I would never use any heater with a built in controller.

Link below is the controller and titanium heating element I use.

The Aqaumedic controller is about the best stand alone heater controller out there.

http://www.aquacave.com/300w-titanium-h ... r-358.html

I have read way too many stories of reef tanks that have been completely wiped out by a cheap heater that either cracked or stuck on.