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I hear everyone claiming tempered glass can't have hairline cracks, it can. I would not put too much water in it though if it is inside the house, 125 gallons of water is heavy.
 

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tempered glass can still get stress cracks in the surface without completely failing, not common but it does happen. I see tempered glass (not laminated like windshields) side and rear windows with cracks at the junkyard all the time but if you hit them with a crowbar they will shatter into tiny pieces. Its been many years since my one and only materials science clas but as I recall the stress is greatest at the center of the glass sheet (talking cross sectional center not the center of the pane) so you can get surface cracks or small cracks that depending on the orientaion will still balance the stresses in the pane.
 
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