I was wondering what that (Petco black sand) was like. The grains are shiny, correct? Looks consistently dark...nice for a shrimp tank. Kind of wished I got that instead of the Eco-complete; but it was on sale for $9 per bag I could not pass it up. The EC is mostly black but there are other colors present as well (red, gray).
Tractor Supply carries it. Check their store locator for the closest location.