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- Jul 5, 2018
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I have a 40 gallon breeder and looking to upgrade to a 100 gallon tank. My 40 has about 50 lb of live rock that is 3 years old. I would really like to start over with the new tank from all dry rock how much better is 3 year old rock vs newly cycled rock and why? I can try to use some pieces of old rock if I have to!