Very cool I use sunlight as much as I can. (tank is close too two windows)
Coral farmers use greenhouses to farm corals with natural light.
I think our climate would work with supplemented lighting on cloudy days as cooling costs more than heating.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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