01-26-2009, 09:52 AM
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I used to manage a business that used a lot of sand blasting sand (long before I kept fish), so I know a little about its properties.
For consistent high-quality sandblasting, the sand needs to be very uniform. Like sandpaper has a "grit rating", so does blasting media. The granules also tend to be very round. This gives it a "quicksand" feel to it even when it's dry. It's very easy to plunge your arm deeply into a bag of blasting media, as opposed to something like play sand. My thought is that it might not have enough firmness, when it sits at the bottom of your tank, to keep your plants, decorations, etc., stable.
Silica itself is quite a stable substance and should pose no harm to the tank. I'm only thinking of aesthetics.
Just my $0.02. If you try it, let us know how it works.