I recently introduced my new crowntail (Jean-Luc Picard) to his tank, which housed a large and lonely ghost shrimp by the name of Sir Francis Drake. At first, they were curious about each other. Jean-Luc would occasionally "nose" Drake, who would dart across the tank. Other than that, they left each other alone. It turns out that Jean-Luc was simply biding his time. After a few days, Drake went into hiding so that he could molt. The moment Drake shed his carapace, Jean-Luc promptly found and decapitated him, leaving the corpse and detached head for all to see. I knew there was a possibility that this would happen, and so didn't allow myself to become too attached to Drake. However, my husband really loved the little shrimp, and so Jean-Luc is now "[my] fish." Alas, that's the last time Jean-Luc gets a companion shrimp.