Love the rocks. Personally I would love to see them almost in a huge mountain top like mound...maybe with layers. But the way you have it setup is really nice as well. The tank is pretty neat too. Are you able to get more stones like that?
My friend picked them up at aqua forest aquarium when he was in California. They are in storage right now for my next project. The hardscape was always a little jumbled. I wish I would have gotten pics of the tank before I tore it down for the rescape, it looked a little better.