I would say it will depend on your stand, and on the tile and tile installation. My front entrance tile is slate and there is no way it could take it. Slate is too soft and the surface is too uneven so any load pushes on the high point of a single tile.
You would want your stand to spread the load over as much surface area as possible. No small feet or legs on the stand. I'm mindful of my hardwood floor and the 110lb guest who damaged it by wearing stiletto heels. If she were wearing snowshoes, she wouldn't leave a dent. It is all about psi.
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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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