Location of your Tank

[gregzz4]

Previously we had a 125g FW with approx 175#s of gravel and 50#s of rock against an inner load-bearing wall on our second floor. The wall is constructed of 2 x 6s over a trippled 2 x 6 doorway, so it's really strong
Even with 2 x 12 floor joists we had some deflection across a 13' wide room
Now, with our 75g on that wall, and the sump equipment in the room on the other side of that wall, there is virtually no deflection at all

I had an engineer, and a contractor friend, look @ our construction
The contractor friend said you'll be fine as long as you don't have a livingroom full of friends over for a party and bouncing on the floor
The engineer said it will not pass a stress test based on his software

Lasted over a year before we sold the tank, but we could make the water move if we wanted to

Hope that's the kind of input you were looking for