No, no gap at all to the ceiling. There's a strip of foam door insulation between the frame and the tank. I put that foam there to prevent the wood from sitting directly on top of the tank where it would get wet.
While the frame is connected to walls on the left and right, it isn't connected to the ceiling at all. That means that the weight of the overhead wall/doors is largely resting on the tank. I suppose that an acrylic tank lets me get away with that.
Like I said...I think I just got lucky because I didn't consider ceiling flex at all.
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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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