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#4
05-15-2006, 06:53 PM
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It depends on if this is your first light, or upgrading.
If you are upgrading from say PC or VHO, then start with it higher up than 10", then lower it down over time. I would also only run the MH for say 6 hours, increasing an hour a week to help the coral aclimatize to the new light. I run my metal halides about 15" above the surface of the water. 
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