Coralife Aqualight. Aqualight, Skimmer, Bulb. Fluorescent & High Intensity Lights

glass canopy for my reef tank or not?

ok im am buying new lights for my reef tank and the website is confusing me so much. i am looking to buy Coralife Aqualight Quad Tube Compact Fluorescent Strip Lights 96 watts at drs foster and smith.com. initially i want to get those lights and get the mounting legs for them and not glass canopy but the site says that i need to have the tank covered. but i seen tanks with good lights without glass covers. so i was wondering if the website is trying to say you need to have a glass cover if your not getting the mounting legs. but if i get the mounting legs i dont need a glass cover. im so confused if you cant tell. for people with reef tanks do you have a glass cover for your tank?

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