Adding new rock to an existing system is dangerous because any ammonia spike endangers the existing fish/critters.
What you describe is an excellent idea for starting a new system. The first rock that goes in has the toughest time. Subsequent additions benefit from the bacterial support on the earlier rock. Save your best rock (most alive) for the final addition. That was what I did when I started my tank. (4 loads)
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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