IMO
if the tile is laid directly on the concrete and the floor is level the you should have no issues. The tile will not compress so the force is transmitted directly into the concrete. A layer of good underlay between your stand and the floor to prevent a high point and the resulting pressure might not be a bad idea.
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Biocube 29 est 05/05/08, Koralia 1, 30lbs live rock, ,yellow tail blue damsel, pair cinnamon clowns, baby snowflake eel,Toadstool , metallic green mushroom, assorted zoos , kenya treen
180gall display, 190 pds live rock, virgate rabbitfish,bluejaw trigger, bubblletip anemone,yellow tang, sailfin tang,melanarus wrasse, cloud wrasse,

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