I have a pistol shrimp and yellow watchman goby in my 13 gallon tank. Is there any way to keep him from burying my rocks and stealing my frags? I now have sand dunes in my tank. Do you think changing to crush coral sand bed would help? I probably have about 1.5 inches of sand in there for him now. I am due for my water change so I was going to pull out some sand and replace it . My sand gets turned over completely probably once a day. It’s as white as the day I put it in.