Hey Bighen just joining your thread, I suggest the same thing as stlouisguy. I was wondering about the same thing because I have a 150g tank plus sump which ended up weighing about 2500 lbs. and thats on a second floor apartment. Alot of people said that it was ok on the second floor, but I went ahead and talk to an engineer about it anyways. And it is ok with that weight 2500 lbs.