Anything that is around a centimeter is far too large. It needs to sugar sized. There is no need for expensive Aragonite. You can use Silica Sand (playsand), or Pool Filter sand (that is silica too), Sandblasting sand is fine too.
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Bob
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To be loved you have to be nice to people every day - To be hated you don't have to do squat.
---------Homer Simpson--------
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