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Black Substrate was: Copper Slag

Alfred Heng wrote:
<<< I thought it would look really cool to have a tank with black substrate,
filtered water and cardinals.>>>

I don't have a clue as to whether or not copper slag would be safe, but I
have seen the new ads for Seachems black Flourite!  I'm positive that would
be safe!  I haven't actually seen the black stuff for sale yet, though.

Dave Engle
Escondido (San Diego) California
I'm really impressed by Flourite!