Hmmm... the stand should be level. A mat or foam can squish down here or there, but not evenly, and cause the tank to twist, which can lead to failure.
IMO get a replacement tank. Replacing glass on on a tank is usually more trouble and expense than it's worth, and not worth the uncertainty of whether the repair will hold.
Jenn
IMO get a replacement tank. Replacing glass on on a tank is usually more trouble and expense than it's worth, and not worth the uncertainty of whether the repair will hold.
Jenn