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Really hard to tell, but is the glass scratched or cracked to the right of the bubble area?
From my understanding as long as there is a seal, which it looks like you are sealed off both inside and out around the bubble, then you should be fine. But I haven't had personal experience with bubbles/or a tank failing. But if water/debris was working it's way into the seam I would be concerned.I'll be honest, you cant even really see that in person. Looks like a light scratch right at the silicon.
It's 14 gallons.How big is the tank?