Tank stand - think this’ll work?

[ADMWNDSR83]

That weight scares me on that one.  I'd say go with the structural wall, and as much surface area as possible in contact with the floor on the new stand, not just four leg spots.

[TheDukeAnumber1]

You have a near best case scenario, placing the tank against a load bearing wall with joists running perpendicular to the wall.

A 75g is a similar load to 3 people sitting close on a couch which we would never expect to cause structural problems normally. If your floor already feels spongy/bouncy and/or you are going to put other heavy loads against that wall there could be cause for concern. Otherwise you'll very likely be fine. 

The next step would be to measure the joists and beam ect and calculate the actual wood stresses.