Yes, any sand that you put in there will become "live" by virtue of bacteria that will colonize it.
Adding some live rock will contribute to the sand life somewhat. The dry rock won't, of course.
Silica sand can work fine if it is the proper size.
Mitch
Last edited by MitchM; 09-10-2010 at 12:37 PM.
Reason: did some more fact checking on use of silica sand
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