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Most of the controllers on the market do that. I have the older Aqua Controller II, but I think even the less expensive Aqua Controller Jr can do that job.
I set mine that if the tank gets to 85F, all my lights shut off. Actually, they turn off in sequence once the tank is at 84F, and as it gets hotter, each subsequent light is shut off.
I also use it to turn on heaters, and it would be possible to even hook up cooling fans with such a device.
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Marc Levenson - member of DFWMAS
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