ok so ive done research and am still worried about my 125 gallon tank im about to setup...its going to be on the first floor of my 2 story house over the basement. it will be running along a wall parallel (yes scary) to the floor joists, even though it will cover 2 joists that appear to be reinforced already. plus kitty corner to that tank is my 45 tall that runs perpendicular to the joists.i know there are tons of factors involved in figuring if im good or not but I really cant get a straight answer, so im just hoping people can post what large tank they have (over 100 gallons) and where it is, preferably 2nd floor so i dont lose 10 years of my life worrying about this...hoping theres people out there with a 300 gallon tank on the third floor lol!.....