6 bulb T5HO should do the trick for you if you buy a decent quality fixture like a Tek. You will be able to keep many LPS with that fixture too, and quite a few SPS even if you wanted to. Of course lighting is only one piece in the puzzle of coral keeping. If you can't provide pristine water conditions, stable water conditions, and optimal flow then you may want a more powerful fixture to help pick up the slack.
You won't get the shimmer in the water with T5s like you do with halides though. So if you really like that look consider halides.
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~ Mindy
SPS fanatic.
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