Flourite isn't black; it's brownish.
http://seachem.com/products/product_pages/Flourite.html
Or reddish:
http://seachem.com/products/product_...ouriteRed.html
Onyx is dark gray:
http://seachem.com/products/product_...yx%20Sand.html
Hope that helps.
Walter
Walter
no thats nots wat i wanted to use..its eco-complete which is black sand pretty much