Ahh that is a good idea drylocking the rocks. I might have to give that a try. The idea of having a matching aquascap in a tank looks sweet. Do you just use a saw and file to make the backrounds? I watched how to make the 3D backround and the guy was using sculpting tools specialy for styrofoam or whateveer that material is. The tools were electric. And melter the material. Wish I could afford a 3D for one of my tanks.