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If this "live sand" comes in a bag, then it's actually just "wet" sand. Most of the little critters in there are already dead. It's cheaper just to use regular aragonite and then let the live rock spread the little critters to the sand.
Aragonite is a common mineral made up of calcium carbonate (Ca CO3) – the same stuff many corals, and some other marine organisms are made from.
"Aragonite Sand" is usually 2 to 4 milimeter sized particals of this substance. The major benifit of using this type of sand is that if your Ph Drops some of the sand will dissolve into calcium and some into carbonate which will help to buffer the ph and keep it from dropping any more, though practically not enough of it will disolve to keep things from dying on you...
As Laura said, the "live" stuff is just wet, and your mostly paying for water weight, though those that sell it will tell you that *SOME* of the bacteria *could* still be alive. (I find this unlikely since the bags of wet sand have been shipped in trucks where the tempature can swing wildly.
All that said, I use it in both my Reef and my Fish only tank. I like the look of the white sand, plus some people think that corals get a small benifit from the light that is reflected by the white color.
Hope that Helps!It's not the size of the dog in the fight... It's the size of the fight in the dog! -unknown