Yes, I also thought I heard "sumpfin" of around 10 years. I would like to think that a tank could last 50+ years but I have a hard time believing this-I don't know why! All I know is that saltwater tends to break down anything-even solid steel, so surely it must eventually break down the silicone too! I'm also a little sceptical about the lifespan, as I'm sure there's a chance that some mfgs. believe that most fish hobbiest will only have a tank for 2-3 years and then give it up due to failure or boredom.
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