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Making a rock wall

Anybody got any experience to share in building a steep rock wall in a
paludarium?  Specifically how to keep the rocks from collapsing?

On the archives, I find warnings about concrete turning into sand and
worries about epoxy and other adhesives not holding up.  From what I
can gather, the worries about concrete turning into sand are unfounded --
providing you get concrete that's built to hold up in water.
(Perhaps "Hydraulic" cement?)

Certainly it would pay to stack up the rocks in such a way that
gravity holds them in place.  Say, by securing them with gravel, but
I'm figuring to run water over the rocks, which would tend to erode
the gravel away, I'd think.

					- Steve

Steve Benz (steveb at tall-tree_com)   |   Tall Tree Software Co.
http://www.tall-tree.com            |   Ph/Fax: 512-453-4909