As said before, find out which way the floor supports run. This will be helpful because you can setup the tank in such a way that the floor supports will hold the weight more evenly. Many people think that these supports will hold the tank indeffinately, even new supports, but thats not true. Your best bet is to look at those supports and make sure they were constructed properly.
I was reading on MonsterFishKeepers and a few people have had a problem with floor supports not being up to par.
After you inspect and feel good with how the supports look, you should set up the tank against an outter wall( weight bearing wall). Those walls were built to withstand most of what mother nature can do.
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