The idea of a live rock is not that because there are a whole bunch of critters crawling on them, well there are but what is most important about having live rock are the bacteria that live on them. They become your natural filters.
And also just from the price of the rock you are buying from the store i am assuming they are not live rock rather they are dry rock or base rock. Just a hunch but i could be wrong. Most LFS if that is where you are buying it from sell them for at least $10 per lb.
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