Thanks everyone. I think I am liking how it is 'scaped right now. Mike gave me a couple of pieces of rock he had leftover. I may look them over and see how they may integrate.
The substrate it completely bare, just looks like a powdering in the picture. Maybe because there is a layer of cork I believe under the tank that may give it that appearance? I forgot what I placed under it, but it is likely that material that gives it that sandy appearance.