Thanks! This was what I had envisioned prior to scaping. But during, I filled the tank with water to look at a few things and it looked pretty cool without the moon sand. It looked as if your were looking at an underwater cavern. Anyway, at that point I hoped that by adding the moon sand I would still have the look but I didn't. I'm happy with the way it looks though. The lace rock is built up for the bottm so it is pretty good barrier between the substrates. My wife suggested, during the scape, that I go buy more rock to get the cavern effect look back but the rock was an hours drive so I went with my original plan.