 Alternative Black Substrate?
So, I was thinking about black substrates. You've got "spectra stone' (yeah, right), ADA Amazonia (expensive), Eco-complete (Expensive), Black Beauty Sandblasting sand (questionable properties), Onyx Sand (buffering capability not always wanted), and the elusive Black Flourite (are they really going to make it or is it just a dangling carrot?) -
Well, I was wondering - what if I had access to a large amount of activated carbon? Would that work as a substrate? I don't really know.
Another thing I was thinking was, "What are eco-complete and ADA Amazonia?" I mean, they have to come from somewhere. I know Eco-complete is mined somewhere in the USA.
Those are questions out of pure curiosity. Seriously, is there a viable, cheap alternative for black substrate? | 
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