First welcome to AA. As far as the sand if not that much then get it and give it a good rinse. I dont go for that prepackaged live sand bit anyway. As far as the LR
, what makes it live is the nitrifying bacteria that colonizes on your LR
. You can not see it but you can test to see if it`s doing it`s job. The little critters that come with LR
are a bonus. So you see it`s not LR
because of the critters you see but the nitrifying bacteria you cant see. What size tank will this be?