How heavy of an aquarium can your floor support?

Kevin writes – “One of the questions that is inevitably asked in every aquarium chat room, newsgroup and bulletin board is “just how large an aquarium can my floor support.” Then the answers follow from people who usually use basically correct structural principles to come to often incorrect conclusions. Unfortunately, I then jump into the fray and try to explain in just a few words, what cannot possibly be explained in just a few words. So the result is that no one fully understands my explanation, since it seems contrary to his or her experience. So here is the long winded explanation from some one (me) that has been working as a structural engineer since 1976.” Thanks Jason! Link.