In article ,
Margolis wrote:
"Elaine T" wrote in message
om...

That sounds like more of what I'm after. I suppose I could do the same
thing with a larger coated gravel and any smaller plant substrate. I
haven't found Onyx around here yet.

So Fluorite/sand or


It is not good to mix sand with larger grained substrates like gravel or
flourite. The two different sizes will seperate with the sand working down
to the bottom and the flourite will "float" to the top of the sand.

That's the theory. In paractice I have fine beach sand and flourite
and there's still an even mix of the stuff. Perhaps it helps that
the flourite is less dense.

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