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black sand
And now, for my next question... Several years ago, while digging the
hole for a client's pond, I ran across several veins of heavy, fine,
black sand. It was in some stabilized sand dunes in Carlsbad, CA. Of
course, I saved quite a bit of it and am now tripping over its containers
in my greenhouse. I know that it is full of Fe (it is extremely weighty,
>/= 75 lbs/ cu.ft.)and I guess my question is, does anybody out there feel that there would be any advantage in using it as a substrate, or
substrate additive, for my aquarium plants, or is it just a waste of
time? It is so fine that I'm certain that it will sift through the
gravel in the aquarium and wind up in a layer on the tank bottom. Thank
you very much for your help. D. Curtright.