Can I put a 120 gallon upstairs without worrying?

[lastlight]

Not a warning per se just my current story. I only have about 35 gallons on my floor. It's an older townhouse with 2x8 floor joists not the engineered ones. I could see the deflection downstairs! Tank bounced very badly too and over time I'm sure it would have gotten worse. I added a jackpost underneth and it has helped. I know I wouldn't place a 120 on my floor but generally I think you're ok (maybe bouncing as you walk by).