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You need to find out how strong the floor is. A good gauge is to just measure as you go up the stairs, the ceiling to upper floor thickness, but you will also need to establish the joist direction.
I'm not certain, but did you want the tank against that wall in the picture? I am guessing that's the bathroom? Usually the joists will span in the direction of the narrowest section. In this case you if you do want the tank there, you might need to strengthen the floor depending on how large you want to go. What were you thinking of size in gallons?

