Mine decorates with frag plugs and empty shells around his borough. I've got a love/hate relationship with him. He wants to spit sand on anything on his side of the tank. He mounds the sand on the other side of the rock his borough hole is on. He will scoop sand from a corner and mound it on the backside of his rock, to the point the bottom gets picked bare and the rockwork is completely buried. Obviously I can't place corals anywhere near his hole. I've got a digi that was there before him that has taken a ton of abuse, but is still hanging on. I spread the sand back with a spatula nightly, but like Sysiphus, he pushes that sand back on his rock during the day.