What section is it in? LOL wow..out of all the places I tried to look, I totally miss the obvious!
+1...but even better is to keep rockwork raised above the sandbed (I used acrylic rods, drilled into rock)...I put my rock in first then added sand.
IMO...eggcrate is a bad idea
Use of eggcrate prevents some sand sifters from doing their job!oh, please do explain.
I don't have any experience with earthquakes...sounds like it might help, but still same problem as mentioned above.I put eggcrate, then PVC rock supports, then rocks, then sand. The eggcrate helps distribute rock weight and minimizes impact from rock slides from a possible earthquake (Socal resident).