10-12-2009, 12:53 PM
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Why don't you have a choice? If you are buying live rock that is experienced, it is usually high quality. However, you want to find out why he is selling the rock. How long ago did he have his last algae bloom? Has he ever treated with copper? Do you have any reason at all to think the rock is not in perfect condition?
Adding this rock will do nothing to your nitrogen cycle. The rock sounds to be fully cured, and will have a significant ability to biologically process waste. This should be a good thing for you.