Pistol shrimp goby pair

I have a Yellow Watchman paired with a Pistol shrimp - very rarely see them. I gave up trying to target feed them. I keep thinking they have both "bought it", then they appear again. I have gone up to three months without seeing them, and all of a sudden - there they are. The shrimp is growing, and the Watchman is anything but skinny.

Go figure... Too bad - the symbiotic relationship is really neat. It would be nice to observe it more readily.