Hi Scott, you're talkin over 1 thousand pounds, so IMHO, if ithe floor is 2x6 joist, you definitely have a problem. Even if it's standard 2x8 joist I would still do some minimal shoring up. I had my 100gal on 2x8 joist for a few years and, though it wasn't noticable there was a small amount of 'sag'. There are other variables, but if you cant determine what type of floor your dealing with I think you're wise to downsize. Clay On Thursday, June 12, 2008, at 12:00 PM, gsas-member-request@thekrib.com wrote: > I have a quick question for everyone. How big of a tank do you need > to have before you should put some sort of reinforcement under your > floor for the weight? I ask this because I have a 150 gal tank that I > know needs to be supported (and is) but I'm moving to a new house next > month and I don't want to add support to the upper floor where I plan > on having the tank. _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member