I have mine setup somewhat simmiliar and my tank temp increases about 3 degree's but I have found out that th reason my temp goes up so much is that my heater for whatever reason turns on every so often and heat the water even though it shouldn't...I solved my problem by unplugging my heater when my hallide is on and now my tank temp doesn't increase at all!!!
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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