Quite a bit more in my opinion.
240 x 8.34 = 2001.6
A 120 empty weighs 215 lbs., so figure 430 give or take for a 240 (a 180 weighs 338)
200 lbs. of sand
that's 2630 lbs. without stand, top, fish, accessories.
Guessing that the stand, top, fish, and accessories won't be more than 370 lbs. That puts you at 3000 lbs.
Figures a 8'x2' configuration that gives you 16 sq. ft.
3000 / 16 = 187.5
Get 15 of your closest friends and yourself and crowd into an 8'x2' area where you want to put the tank. This should give you an idea of what the floor will do.