trial en error.
You're going to be watching your corals closely to see what the appropriate height your lighting should be....
depends a lot on each coral and your water clarity, type of substrate, black painted back panel, etc...
every tank will have different factors playing into the correct configuration so you might as well take a weekend and don't stop fiddling until everything looks happy.
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Happily Ever NOW!
Current Tank Info: 95 display mixed reef w. 60 sump, 2 gal 'fuge. AP12 70w HQI mixed reef, 100 2X400w Frag Tank
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