Base rock will eventually become live rock 
What makes rock "live" is the bacteria etc. thats growing on it. Either way, base rock will become what you buy as "live rock," just takes a little more time. On the bright side with base rock you know exactly what your putting into you tank  .
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75g Soon to be Reef, Born 01-22-2008,
2 - 250w 14000k South Pacific Sunlight Metal Halides,
2 - 110w VHO Super Actinics,
ASM G-1 In-Sump Protein Skimmer,
200w Heater, 80lb Base Rock w/10lb Live Rock,
80lb Sand, 30lb Live Sand, 29g DIY Sump, Fuge.
Fish:
(1) Yellow-tail Damsel
(1) Six Line Wrasse
Clean Up Crew:
(16) Blue-legged Hermits
(5) Scarlet Crabs
(1) Emerald Crab
(20) Astrea Snails
(10) Trochus Snails
(10) Cerith Snails
(5) Nassarius Snails (sm)
(5) Nassarius Snails (lg)
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