Thats why there is a sell by date ;)
in theory it should only be bagged for x amount of time, but still I have seen some pretty cool stuff come from just bagged live sand. Where else would our pods come from for example? Those would most likely die in transit of live rock right? I like to think of it as acting like how brine shrimp eggs and that it can be dry for thousands of years and once they are in water again can hatch.
But to the OP as far as getting water to help establish a tank the benefits really would be fairly negligable as the majority of bacteria (nitrosomas and nitrobacter) we want in our tank use a substrate to grow on. Grab a cup of sand or live rock, or bioballs, or other biological media and you will get plenty of the good stuff to help speed up your cycling process.






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