Will this hurt or help my MH bulbs? Hi all I have a big fan on one the side of my canopy and when its on my whole canopy is a small thunder 
The question I have is will it hurt my bulbs? because they are cool all the time when the fan is on.
I would like to keep it that way cause my temp went down about 5 degrees  What you think?
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10 months old 75Gal 20Gal sump/refu 425W MH and 40W actinic, 3 power-heads and one return pump total of 1600Gph Venturi style skimmer rated for 150gal, 100Lb of LR 100lb of LS 1 Yellow tang,1Blue tang, and 1 cleaner warsse |