Used live sand

[asylumdown]

If you rinse it decently there's not really a reason not to. Especially since all it ever got was wet. For all we know, the bags we pick up could have been sitting in a warehouse for years before we bought them, and before that they were either on a beach or wherever it is they collect that stuff for hundreds to thousands of years, so a few more years in a tote with no organic inputs shouldn't have hurt anything.