"Jeffrey St. Clair, Ph.D." wrote in
message ...
Are you referring to play type sand?

No, not the play sand. It's too fine. I'm thinking about builders sand which
is a little more coarse, cheaper, darker in color and used to mix to make
concrete.

I'd avoid it as it has clay and really
hard to rinse out. You could do just sand and then you just shake your
python an inch from it and it will suck up the mulm. I wouldn't mix the
two substrates as they will mix into a sand/gravel mess. Sand is great
though, because of it's density, nothing sinks in like with gravel, etc.

I was afraid it would go anaerobic from fine mulm if I used just sand or a
sand mix and didn't or couldn't vac it.
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RM....
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