I have my 120DT/40b sump pretty close to the middle of my living room. It sits perpendicular to the joists, and pretty much on top of a steel Ibeam. It's rock solid.
I had a 75 on a second floor apartment building with a 30 gallon sump so it was pretty close to your weight and I had absolutely no issues. Even had some friends over and kids all sitting in same room at the table just 2 feet away a and 2 of them are some big men. No issues at all.
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