11-14-2007, 08:54 PM
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I'm not a salty, so I have refrained from answering this post, waiting on someone else to give it their effort. I have used heaters with external controls a long time ago. I did it out of necessity rather than choice. I had a 300g tank and needed to heat it. At that time the only heaters I could find were heaters that had to have an external control. They came with a sensor that was in the tank, an external controller, and the heater. The worked just fine. But a word of caution, you get what you pay for and good heating setups like this can be a tad pricey.