75g's can cause trouble, but usually don't, you are looking at about 750(Give or take depending on decor, substrate etc.) pounds spread over 864 sqare inches, so unless you have it in a really bad spot you should be fine. I weigh 440 pounds and my Brother weighs 360, and we can stand next to each other almost anywhere without falling through the floor. I would make sure you have the stand supported evenly and very level, as weak floors are known to sag a bit, and twist a tank which will eventually lead to unzipping of seams. It is always wise to take a good look at the structure below a proposed tank spot, and also to situate the stand so it's perpundicular to the joists not parallel.
dave