Hi Genix,
The best fix is to shim the desk, at floor level. This gives the tank the full flat surface of the desk so there won't be stress points on the glass. As others have suggested, wooden shims from the hardware store will do the job. I have also shimmed tanks by cutting decreasingly shorter strips of corrugated cardboard and stacking them one on top of the other to act as shims. You have to allow for some compression but not really that much, actually.
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silver surfer reviews