hey deuce. be careful about placing something that big upstairs. consider the fact that commercial buildings are built to a higher strength factor than your house. if you are building a typical new home, (which is "light weight construction, not heavy timbers) you'll want to consider adding some vertical supports under the tank's location to help support the load of a 240 gallon tank. you may have to also add additional cross members or sheeting to spread the dead weight load across several more floor joists. a bedroom will have several thousand lbs of stuff in it, but it will be located at several different points in the room. you may want to have a bldg. engineer look at what you're trying to do in order to find a good location upstairs to install the aquarium.