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favorite substrate

I would like to put in a good word for my favorite substrate at the
Onyx sand.  Though some compare to asphalt in color, it's a nice light
and the texture is more rounded and more like real sand than is
Fluorite.  Seachem
makes both of these.  I don't care for Fluorite because it looks
artificial to me, since
it's red for one thing and the "chunks" of it are hard-edged - it looks
crushed, not
naturally eroded.  Onyx looks more natural and you get the same
benefits of not
having to add laterite.
Roxanne Bittman