Leave it open on the theatre side...I think closing that off is a HUGE mistake. If you are concerned about light entering the theatre room, you could rig up some sort of shutter or curtain system to block it off.
I would also recommend access to the tank from both sides, even if you choose not to view it from the theatre.
Are you planning to house the entire filtration setup under the tank? Think hard about access to all the components.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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