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Re: [APD] Soil master black/charcoal in Sacramento
Wise, Nicholas wrote:
> Well, one difference would be if the black substrate is naturally black.
> I personally have never seen rocks occuring naturally in day-glo pink or
> the aquamarine you see in pet stores. The colored gravels are basically
> painted rocks.
Ah ha. I hadn't thought of it that way. I just was thinking in terms of
habitat-specific when I was thinking of what constitutes natural (kinda
like putting sea shells in a goldfish tank). I was under the impression
that black sand/gravel is of fairly limited occurrence, especially in
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