when you look for your place check out what the floor is made of its on a concrete slab I would not worry about the weight issue if its on a second floor with wood floor beams then you have to make sure that the tank is going across the floor joist and not in the same direction,usually floor joist run in the same direction as the roof rafters and make sure the tank is up against a outside wall,not towards the center of the room as it will add more stress to floor joist.keep plenty of old towels near your tanks in case of an accident. and a wet dry vacuum would not heart.Like the other people advised you get apartment INSURANCE. Its not very expensive maybe $150 to $200 a year Good luck Noel PS worked 20 years building dormers and Extensions