Bubbles in silicone, cause for concern?

Alexraptor

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I have a custom 38 gallon tank that is about 20 years old, and I noticed some air bubbles/pockets inside the silicone today, near the top of the tank.

Is this cause for concern? is this the beginning of seam separation, or just something I should keep my eye on?

Here's a macro shot of the entire affected area. (NOTE: Ignore the huge splotch near the top, thats just salt splatter!).
P_20240519_122720_1.jpg
 

TX_REEF

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Given the age of the tank, I would plan a replacement/upgrade. It might be fine, it might not - and if it fails, it's a safe bet it'll happen when you're not home unless you have eyes on the tank constantly.
 

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