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Niko!

You can get pumice stone at any Orchid supply store. It is a substrate that is often used. If you have a Bonsai supply store, they can probably get you the rounded pumice that is from Japan and that Amano uses for his PowerSand. Heck, I think I have a bag lieing around here.
 

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Niko,

I use larger pumice stones. Size is probably millimeter. I like that size as it keeps the substrate loose and provides plenty of space for gas exchange and bacterial growth.
 
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