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1,983 Posts
If the joists that the wires are running through is the floor that the tank will sit on, you'll need some added support. You'll need to block those joists every 8" or so at the very least. If it were my house, I'd probably add in some support struts to the concrete floor below. Something along the lines of the screwing floor jacks would be the best way. If that's not an option, a couple 4x4 posts could work. You'll want the tank to span as many floor joists as possible going perpendicular to the tank.
*edit*
After looking over the pictures again, I don't think I would put a tank on that floor in the current condition. Those spots where they cut the joist and added the metal bracing is a huge fail point. There's just no stability there. I bet your floor flexes if you jump on that spot. You would need some serious reinforcement around those cutouts to even consider putting a tank that big on that part of the floor.
*edit*
After looking over the pictures again, I don't think I would put a tank on that floor in the current condition. Those spots where they cut the joist and added the metal bracing is a huge fail point. There's just no stability there. I bet your floor flexes if you jump on that spot. You would need some serious reinforcement around those cutouts to even consider putting a tank that big on that part of the floor.