You could get just as much light with a 6x80wattT5 setup. If you get a T5 VHO setup (6x100watt), it will be bright enough to grow SPS on the bottom easily... so perhaps too much. Id do a 6x80watt setup myself on a 125g. 3x250watt halides is more than you need, and alot more wattage.
check out reefgeek.com for a t5 retro.
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