Yeah, I went to pick up some black lace rocks on Friday from my LFS. I was going to buy some Texas Holey Rock but I didn't want to have to pay for shipping on 50 lbs. of rock.
And yeah, the fish seem to like the rock pile on the right more then the one on the left. But with this setup I can actually see the fish now as from the previous setup with just the rock pile in the middle, they were basically always in the pile.