Let me keep my comment simple, understandable, on topic, rational, self-explainable, etc.
When was the last time you seen a funny video, a news story, a video, etc. of a tank crashing through the floor? Nice stuff to inspire nightmares, doesn't happen in real-life, unless the building is NOT built to building codes.
In other words, any tank you can buy--INSTALL IT. If it goes though the floor? SUE!
Regards,
TA