I just had to go through the same question as i am making my new tank which is 96" long. The floor is over the garage and its in cement. A civil engineer came to my place, look at the plans and made all the calculator to see if the floor can support the floor. I had previously a 180G tank and now going for 420 + sump for around 600G. After calculation, he told me that my 180G was already overweight, even if it was holding, with time, it might have been dangerous. For my next tank, there will be a jack post in the garage to support the weight, actually 2 to make sure.
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