LOL
I am not an egineer, but I have a feeling that the article was probably written on the conservative side..
however, with tanks over 125 gallons I think careful consideration needs to be paid to avoid damaging flooring
you will often hear people say 'oh, its only (some small number) of pounds per square inch, its fine...
problem is, that most of the time the person is looking at tank as if the weight is spread out over the ENTIRE bottom panel, which it isn't - 99.9% of stands have perimeter support only.
which means that the full weight is taken around perimeter of the stand only..
another thing that the article mentions was the rating for floor strength is as if the whole floor was taking the weight..
with a giant aquarium, we are loading up a small portion of the floor with the enormous weight...not spreading that weight out over the entire floor...
now, has an aquarium ever crashed through the floor? probably not in North America at least.
but can an aquarium as large as 265 gallons do some serious damage to the structural integrity of a floor if it is not beefed up/supported properly?
I would think so.