I just bought one of these from my LFS. I was looking for a good sand sifter, asked when they would restock on Sand Sifting Starfish, and the guy there pointed this out saying they were hardier than Starfish, and less finicky. Mine looks like a Star Trek Tribble with skunk like coloring. I put it in the tank, and it immediately burrowed out of sight, but I was told to expect it in and out of sand once it gets acclimated. They are REALLY interesting to look at though. He also did well against my bully of a Dottyback. When she went to harass him all it took was one poke of her nose, and she stayed clear of him afterward.