sorry for the arguing. I could have just said that I have 3000# sitting on the second floor of my house (6'x2' stand = 250#/ft)I doubled up 1 12' 2x10 in my floor, because the gf was a little scared. to help the 3 joists it sits on. There is 0 movement when I jump next to my tank. (I'm not that small
). Stick to your plan you will be fine.
I wouldn't be surprised if a bus was only sitting on 12 sq/ft