Actually, depending on how the stand is built and placed, and how big the foot print is, how new the building is and where the apt is located in the complex, it is possible to keep it.
Mine is only a 160, but by by doing some basic math and resurch on the floor construction I have have determined it will hold and I'm on the 3rd floor.
I figured that an overestimated weight would be about 2500lbs with everything. Now my stand covers 14sq feet of floor area. Divide the weight by the area it covers and that is the amount of preasure per sq foot(178.57). I weigh 200 lbs and with my feet together I dont cover 1 sq foot. My 40gal, doesnt cover 2 sq inches and that's about 450 lbs. Also, it is important to cover as many floor studs as possible. Best to go perpendicular to the joist's. I don't, but I didn't have a choice.
This is just all on paper. I have only filled it for a short time to clean it out. I have not filled it completly for any length of time yet
so don't fill it on my logic.
MAKE SURE YOU HAVE RENTER"S INSURANCE, and just as important, check with the building management
pics are on my site