In my 260 I started with the "pile". It's a detritus trap and for large fish it inhibits their swimming space. One too many times a rock would tumble and leave a path of destruction. I took half my rock out and the rest was drilled and threaded and permanently placed on clear acrylic and carbon fiber rods. The fish have more room to swim, I have access to everywhere, there's better flow, and it looks more natural.