It is for light diffusion. Look in the lighting section around the florescent lighting.
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Proud Member Idaho Marine Aquarium Society
A fair and biased reef hobbyist.
"If I were going to set up a tank, and I am going to make some people mad here, I would use VHOs" Dana Riddle 3/2/2007
Current Tank Info: Brand new 150 gallon tall Reef trying Bonsai method, 60 gallon soft coral tank (not GARF style).
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