[sasharotty]

Do a search on it. 100's of threads on this topic. Im personally setting up a 180 in my 1st floor den. I had a structural engineer come in and give me his thoughts. I was told to "sister" the joists and reinforce joists with posts. My tank weighs 400 #'s dry, add in water, rock, sand, canopy and stand im close to 2100#s. Is the tank perpendicular or parallel on the joists? How old is the home and condition of joists and flooring? Whats the spread on the joists? Is it going to be on a load bearing wall? My suggestion is to get someone in there that can take a peek at it and have them give you their professional advice.