The tube didn;t have anything to do with it. Glass is made under stress. It allways has unseen internal stresses and sometimes, even years after manufacture, it can crack with the slightest weight or anything.
You can take a piece if glass and silicone it over the crack. I've done that with great success on the side of my 10g sump when I crack the heck outa it
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Dan Pesonen
Umm, a tank or 5
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