I recently purchased a 40 gallon tank that is 36 inches long. I have it on a stand that is 34.5 inches long so it hangs off about 3/4s of an inch on each side. I recently noticed that on one side the bottom appears to be pushed out very slightly and the top has been pulled in slightly ( almost like pressure is building up and pushing the bottom out forcing the top in) I am uncertain if it came this way or has just happened.. Can the fact that it is hanging off 3/4 of an inch be effecting it??