erik, I had a 12o gallon cube w/ a 40 gallon sump and a heavy frickin stand in my apartment... no problems w/ it falling through the floor.

but here is something to think on.

one bad day.

2800$ in repairs to my downstairs neighbor later... no more tank and a heck of a lot of OT to pay for it.

my advice?

while your in an apartment, reign in your cravings and do something more along the lines of maybe a 50 or less. I went from a 120 cube to a 30 cube.

the 120 was totally overpowering the room it was in anyway.

that's just my two cents... a leak in your hose sucks, a leak into your neighbors home sucks more.