I have had a pink spotted goby/tiger pistol shrimp pair. These guys when I first bought them were never seen,but since I have moved the tank to my bedroom where i spend the most of my time they have started come out more,and when the door is shut away with just me and the tank(i have 2 loud toddlers) the goby will come out and stare at me and the pistol will venture out with him. The one drawback to having this pair is the goby will snatch hermit crabs from time to time(i have seen it happen) and take it back to the pistol.Lots of personality from the goby and I like to watch my pistol work away on his new hole,I recently bought a "coral" from my lfs but the darn thing moves causing me to think its not a coral even though I know of 4 coral species that will move. I think the movement of this "thing" (cant get a possitive id) has caused the tiger/goby to relocate and I have been able to watch the tiger work away closer to where I can see him more often