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Copper Slag

I know that copper is bad for any tanks with plants or fish, but I have a
question about copper slag.  It's a by product from smelting copper.  It's
like black crystals and is used for marine sand blasting (I think). I
thought it would look really cool to have a tank with black substrate, peat
filtered water and cardinals.  Does anyone know what this is and is it is
safe to use in tanks?