RocketSeason: Yes, playsand will eventualy become LS
fromt he LR
, but if you have a few bucks, I would reccomend getting a couple pounds of LS
from an established tank to add to your sand to improve the bio-diversity of the life forms in the sand.
42jeff: Silica sand can be used but argonite sand is much prefered. The only issue I'd be concerned about using sand from dug up from inland would be possible pollutants. I'd check on that before adding it to your tank. (again, you'd be better off with argonite sand any way)
and yes, Yard right/old castle sand is argonite sand from the ocean floor.