By looking at the photo of the steel stand it appears all the load is transfered down to 4 point loads (the metal stand legs) on the floor surface. The odds of that lining up directly over floor joists is slim. I think some kind of support should be provided at these locations to distribute the load more.
Large tanks on a wood framed floor seem to always create considerable deflection in the floor. Consider the tank full and someone walking across the middle of the room. Kind of like the diving board effect. I've watched the water in the tank create a nice wave in a 72gal tank sitting near a wall on a wood framed floor. No party's
unless you crack out the motion sickness pills.
On the other hand, another telepost in the middle of nowhere below sure makes for wasted space. There is a lot of other factors that add to the puzzle such as floor joist spacing, joist type, span etc.