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So I have a similar question regarding bubbles in Silicon seal. I just bought a used 125 gallon aquarium and noticed bubbles trapped in the silicon. This appears throughout the sealing around the aquarium. I'm attaching some pictures for your review. Do I need to apply new silicon? The aquarium was manufactured in April 2014. The previous owner had the aquarium in use up until the day I bought it. The aquarium base did not show any trace of leaks either. I'm concerned about the long term impact of these trapped bubbles. If this is an issue I rather address it now when empty than when full with live stock.