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Idk if they do or not, but I would imagine it would be at least wet. But live sand is honestly not as important as live rock is, so i would only buy live sand if i liked the way it looked.
Thats the only reason I got live sand one time. I wanted the pink sand. LOL I didnt wash it or anything though, just in case there was some life to it. But I didnt' notice any difference between the live ssand and the pool filter sand I used in another build.
Bacteria are more hardy then you give them credit for. When conditions go bad they become dormant...then when conditions are good again, they start to grow and reproduce. Some live sand actually have the packets of bacteria inside the bag of sand.