In the Fake Stones Shader just under the Seed generator, there is an input line. I add the surface layer here. When you open it up using the Arrow Button on the right side, it opens the node to this surface shader. Now you're ready to add color/displacement power fractals to the surface layer created for the Fake Stones. This surface shader is separate from the rest of the main layer window. It only has an effect on the fake stones this way. I give it some name like Fake Stone Surface 0.5. The 0.5 is the largest scale that the fake stones use.
I hope this makes sense. I had another rough night with the residents.