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Bubbles in silicone joint

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Hey everyone,

I have a 29g tank thats been operating for quite some time.

I am not sure however the front right joint seems to have some bubbles within the joint of the two pains of glass. The silicone within the tank itself appears to be solid and not peeling, however the bubbles in the joint are a concern for me.

Would hate to wake up to a apartment full of water, but even worse, would hate to wake up to a few dead fish!

Here are a few photos(some got a photobombed)