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In my experience with a tank that size, the switch from T5's even to a single 70W MH will be significant heat wise.
150W will not be too much for the corals, yet obviously you're dealing with more heat.
If you have a decent ATO system I think you could do either one and run a few fans with no heat issues. With an ATO I personally would do the 150W yet I know the 70W will grow SPS and clams nicely.
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Still fighting entropy.
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