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Aquarium Lifespan

    My 55g is approaching 15 years of service, and I have never had any major 
problems.  However, I am seeing some of the silicone sealant on the outside 
(a thin bead inside a small bevel) fray and break off.  I am under the 
assumption this is from years of cleaning.
    I was wondering: Is there a typical lifespan on silicone sealants, or is 
there a suggested frequency on refurbishment of the aquarium?  Or is the 
lifespan of aquarium sealants indefinite?