I spoke to rep of a large tank manufacturer a few years ago on this topic,they informed me that there product testing suggested silicone seams start to break down around 10yrs. I know a few people who have had there tanks running for double that, but i would never chance it!
I have replaced my saltwater tank 3 times in 15yrs at 4 to 5 yrs apart. My tanks have also been produced by a large manufacture, so if they were custom built by a quality smaller shop i'm sure i would have given them more years.
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