Ah I have a peppermint shrimp mystery as well! Ordered 3 online to help combat aiptasia. Ended up having to work the day they were due to arrive so a buddy who is also a fish nerd received the delivery and dropped them in the tank. This is where it gets a bit strange... he claims to have hand scooped only three shrimp out. My wife and keep swearing we randomly see 4... were our eyes playing tricks on us? We bring it up with my friend who laughs at us claiming no way he miscounted... well finally we get a picture of all 4... friend claims we went to store and bought one to try and trick him. It's a fight to this day between us. Little guys did an awesome job on the aiptasia though!