I am just saying it don't make much difference.. Floors are designed (residential) to carry around 40lbs/ft2 live load (plus fudge factor).
Spanning accross more joists does help some, but even a concrete floor is done the same way, the reinforcing in the floor spans like joists.
Generally concrete floors are used for larger spans than wood joists can do.
Not all floor systems are 'I' joists either, they may be open web, or even just 2x10's.
What I am getting at, is there is no right answer, each floor maybe different on how they will handle the load. The further the clear span, the more problems you may have, and the smaller tank.
The only way to truely answer on how big of tank you can have on a floor is to have a structural engineer review the floor system from building drawings. Or just play it safe and figure how much your tank & system wieghs, and figure out the load per ft2.
This is what I do for a living, so I have a good idea what I am talking about.
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