typically you want to run a large tank right across of an i beam or reinforced beams from the basement. If you don't than your tank will not crash through the floor right away. It will take years for the floor to finally give way. This is why grand pianos that way 2,000 lbs. have been fine throughout the years. The main thing is to take in consideration that all you weight is in a very small foot print. reinforcing your basement doesn't have to be a major task. Adjustable steel poles from lowes that raise up to 8' 4" will do the trick just fine. I suggest using a 2"x12" BOARD ABOVE YOUR NEW BEAMS AND UNDER YOU SUPPORT HEADERS. You want your beams to run in the opposite direction of your support flooring. If you set-up your tank in the middle of the floor it will be fine for a while. However, the floor overtime will start to sag. Therefore if you ever move you will have an extreme dip in the middle of your living room. By the way the strongest part of your sub flooring is the actual point that you floor meets the exterior portion of your wall. hope this helps