Unfortunately, the diamond sleeper/diamond watchman goby will always be the master of your sandbed. He has the blueprint and makes sure the build is to his specs. No matter what coral I have placed on my sandbed, I have had to move it to a different tank due to my goby wanting to move it or cover it up. A month ago, I dropped a cyphastrea frag in the sand and was going to go back and get it when I was finished cleaning powerheads. Well, I completely forgot. A few days ago I remembered and was looking for it. This guy took it under his favorite base rock. It was still alive and had great color. The diamond sleeper goby has amazing character and personality. Your sandbed will always be his artwork.
Happy reefing!