not too long ago somebody posted life expectancy of tanks but now I can't find it. I think it was in reference to how it's shortened by the use of waveboxes.
What was it? 10 years? 15 years?

I am leaning towards buying a new tank but wouldn't want to miss out on a good deal on a used tank.
At the same time I would hate to be the one that fully stocks a 215 gallon tank and then the silicone fails and leaks all over the place and me having to find somebody to reseal the whole thing...