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Re: Is marble safe in tanks?



Gitte writes:

> I know slate is okay, but does anyone know whether marble leaches anything
>  nasty into the water?  I have a bunch of broken marble and wanted to put it
>  into my 10-gal tank.  I have not yet tested it, as I don't have any 
muriatic
>  acid.

Marble is metamorphic limestone.  It will slowly dissolve, increasing 
hardness, alkalinity, and baseness.

Bob Dixon