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#3
10-14-2010, 02:19 PM
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With only MH you'll likely want a higher K bulb so I'd go with three for sure. Using two will also not light the whole tank and create two distinct lighting patterns which some people prefer but it can limit you in coral placement.
You can always start with two and go from there but personally I would get at least 3. Last edited by sphelps; 10-14-2010 at 05:34 PM. 
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