I'm no engineer but have been in the manufacturing trades for a long time.
When it comes to houses there are a ton of variables. What do you mean by concrete pad, The concrete wall of your foundation that the end 6-8" of joist sit vertically on? is this an older home with solid wood joists or engineered joists(particle)
120G water 1000lbs. empty tank 250lbs. Rock/stand/equip... 150ish = 1400lbs
Id say if your on 2 joists( should be min 3 with 48" tank) and your less than 4' from an outside wall your good. If these are engineered particle joists and they get wet somehow you could have a warpage issue without catastrophic failure.
Just my opinion
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