In article ,
"Dave" wrote:

Gravel or similar rocks
are better off on the bottom to help prevent toppling over.

Or some lead bars. (A really good idea actually if it's not an edible).

If you want to try THAT solution, e-mail me.
I might be able to help you get free lead if you want to work for it.
--
Peace, Om

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"My mother never saw the irony in calling me a Son of a bitch" -- Jack Nicholson