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Old 07-04-2005, 12:29 AM
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Default MH distance from water surface?

It is a DIY retro 175w 20k XM bulb, going over a 20g standard size tank. There is no glass or aycrilic between the light and the water. How far should the light be placed above the surface of the water? I'm thinking 12"-16". Does this sound about right?
thanks
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50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor
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