It does depend on the stand construction, but also on the floor.
I am assuming that this is an older home with maybe douglas fir floor joists, a 3/4" subfloor and 3/4" hardwood flooring material.
Is the hump from the subfloor and floor finish material? Or is the hump from a crown in the floor joist? Is the hump stable? Does it creak if you stand or jump on it? If the hump isn't stable, anything you pour on it now will surely crack once weight is put on it.
If the hump is from the hardwood flooring and subfloor only, the tank setup may level itself.
If the hump is from a floor joist, then even 2500 lbs won't straighten that out and you will need to shim.
If the stand is built with bottom plates on edge, then you could be fine with relying on 3 points of support - the hump plus shimming on each end.
If the the stand is built with bottom plates on flat, then shimming in numerous places under the stand would be recommended.
Lots of "if's". Pics of the stand, floor area from above and below would help. Hopefully you can see the underside of the floor from the basement.
Mitch
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