If you are doing this primarily for fish, I would suggest a longer tank, because your fish will be much happier with more swimming length before having to turn around. Say a 4 footer. Then Put your HQI in the middle, and have a large rock pile in the middle with your SPS corals on it, right under the MH.
Then just run cheap fluorescents over the rest of the tank, like a FOWLR. This way you only have to spend a little cash on some strip lites, and you will utilize your MH for your light demanding corals in the middle of the tank.
This would be a good setup for future expansion too, you could add a second MH bulb anytime, and make the fluorescents actinics.
But it depends on how much room you have, maybe you dont have 4 feet of space. Just an idea for you.
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