tank wieght question plz?

It all depends on the house and the supports on the second floor. On mine, I'm pretty much maxed out and it's an outerwall. That's alot of weight and stress you would be adding to the floor.
 
if you fill it make sure to video tape it and tell the people under you to evac for the last day while you fill it.

I would get an opinion from a trusted contractor.
 
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