Do I have a threesome??

[magnaflux]

Watchman Goby + Pistol Shrimp + Fire Shrimp

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[Sk8r]

Shrimp are naturally curious and not always nice to each other. But your pistol will burrow. So will the watchman. I'd worry a bit because pistols usually pair with other sorts of goby, and they can kill a fish. I'd really recommend taking back one of the three amigos and going for something like a royal gramma or the smaller goby (a highfin redstripe, eg) that would go with the pistol.