My 155 is on the second floor and I too was concerned about whether the floor needs reinforcing. From what I understand, 150 gallons is about where one starts getting concerned. I do know you are better off against a load bearing outside wall than as a room divider though. To be totally sure you'd best get an engineer to test the load capacity or just do as I did and fill it up. Any others with big tanks on the second floor??
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72 G Mixed Reef
155 Bowfront
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