Does laying some egg crate down under my live rock have any impact on a pistol shrimp assuming I do not cover the entire bottom? I would think if you layed egg crate down and then covered with sand the pistol shrimp would be unable to make a good home of tunnels etc... Any harm with putting a little 4 inch square under main rock supports and let the little guy dig around that? Im setting up a 20 gallon and debating this. MY 105 gallon has star board with an acrylic rod used to keep the rock work from tumbling. Was just thinking of doing something different in the 20 gallon office tank.