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Originally Posted by dunl
You mean lights on at night, not during the day?
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Yes, exactly, or at least something close to that.
Heat from the tank lights will help to heat the tanks in the dark.
It might also improve pH stability.
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Denis
150g SPS reef;3x250WHQI,Tunze Streams,Wavebox,Neptune Apex,fishroom in basement
,reefing since 93,SPS since 99.
TOTM June 2010