So I am thinking about getting a 40 gallon aquarium but the Stand I have measures at about 32 length and the tank is 36 inches in length. Would the tank be ok sitting over the stand on each side about 2 inches?
Then you definitely want to support the entire bottom. Theoretically it should be ok, but acrylic does flex and that would be strain on the seams, plus any tanks I have seen specifically state that not providing complete bottom support voids any warranty.
piece of 1/2" plywood would remedy it without being too obtrusive.