Shao, how long has that tank been in that position?
I would think that for a glass pane to crack, something must have shifted. Albeit slowly.
The stand?
Or maybe a slight shift in the floor, then the stand accommodating that.
IMHO
I am only asking cause when you setup the replacement, you should think about why this happened.
I am glad you caught it in time, water on the floor is never good.
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