Isnt most live rock older than 3 years? How do you know how longs its been in the ocean for . I agree that live rock will build up with crud if you don't have the right fauna to keep it clean but I don't think it expires . If you where really worried about it you could bleach the old rock to dissolve the organics then cure it/ re seed it , but maybe that's just me an im too cheap to throw something away that cost me 4$ a lb .
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