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Small bubbles in aquarium silicone

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Hey guys quick question.  I have a 75 gallon aquarium and I noticed these bubbles forming on the outside edges of the silicon sealant. I know the most important is between the seam of the glass but I was wondering if this is okay? 

The tank is a year old now, is this just normal aging of the silicone ?? Should this be concerning?

thanks !




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