I had 36" NO on my fresh water and my FO tanks.I picked them up a Canadian tire.I dont think they will do much good over a reef unless you DIY a hood and put then in as suplimental lighting.For your FO tank they should be fine as long as you don't put anything light sensitive in it.Oh for question #2 they should be NO,but check the number on the ballast.Depending on the lighting needs of the studio they could be HO
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