I use 3 heaters connected to a controller. I now have a ProfiLux controller and 2 x 250W and 1 x 200W heaters on a 525G system. Prior to the ProfiLux Controller I used a Medusa Heater Controller. I was struggling with the same problems heaters quitting and heaters sticking on. My LFS suggested the Medusa and it solved all my problems. I have even bought other peoples broken heaters that were stuck in the on position and used them until they quit altogether. All heaters fail sooner or later.
At the REEF NETWORK swap meet Jason Mck had a Medusa for sale, this would solve your problem once and for all.
Tom R
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