I suppose that depends on what light requiring organisms are trying to live on the rock. Certainly, at some point all algae will die...which is the entire reason why some people leave LR in the dark for long periods of time.
I would assume that a few days won't hurt anything. Every plant/animal has to be able to tolerate at least 12 hours of darkness per day, right?
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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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