Ok, call me paranoid but I could barely sleep last night because I had this running through my head. About a month ago I set up a 125 gallon Freshwater Stingray/Discus Tank in my third floor Wood apartment. My tank and everything in it wieghs 1518 lbs (give or take). Now yesterday I did some research on my building and found out that my floor can take a live load of 40 lbs/foot I am running 166lbs/foot with the fish tank!! I have this Tank Running perpendicular to 4 floor joints @ 16inch on center and I am right against a load bearing Wall. I have nothing else on these beams except a love seat. Now my friend Matt (who goes by X3ROX on monsterfishkeepers) also lives in the same apartment complex (but in a different building) on a 4th FLOOR and has a 125 and a 40 gallon set-up on the same beams. He has had this set-up for at least 5 months now and has had no problems. (He's not concerned about it because he hates the complex we live in and is moving out in a week or two!! Haha. Anyway, I also found out our building was built in 1996 which I guess is a good thing because they used bigger beams compared to currently built wood buildings. Now I know this is something I need to ask a Structual Engineer, but is there anybody out there who can help put to wrest my concerns or make them worse. Is there anybody who has a similar set-up and has felt comfortable with it?? My floor hasn't made a sound since I set it up.........I just don't want to kill the people below me one day, because I'm going to be living in this place for some TIME!!! (2 years max)