I have a Mystery myself, And trust me when I tell you He's not Shrimp friendly. I had a Lightning Wrasse in the beginning that left my shrimp alone, once I introduced the Mystery they teamed up to eat 3 Cleaners, 2 Blood, and 2 Peppermint Shrimp. I Actually saw the Mystery go after my small gobies, and catch a couple of them. They are very good night hunters, and even though the Lightning Wrasse became Super Male because of the introduction of the Mystery. The Mystery is very aggressive towards Him.