I have a yellow watchman goby paired up with a tiger pistol shrimp. My story starts out like this... one day the shrimp dug his burrow right up against the glass front of my 44 gallon tank. Oh, how happy I was! I had a direct view into their burrow and could see the inner workings of their symbiotic relationship! Sadly, my tale now takes a darker turn. I had a scooter blenny. What a cute and fun fish! Always jumping at the glass edges, doing a little dance for me, and he was friends with my ywg before my pistol shrimp came on the scene. *sigh* One day I wake up and come out to check my tank, and there in the middle of the underground burrow is my pistol shrimp with my adorable little scooter blenny firmly in his claws... and he was STILL ALIVE! The little guy wasn't moving other than gasping for air as my pistol shrimp used his claws like a can opener, prying him open. The horror! I couldn't stop watching, but I couldn't get him out, either. My goby just pushed past as if nothing were happening, coming and going as normal. Eventually my boyfriend had to put a sticky note on the glass so I could stop watching the tragedy unfold. Anyway, that's my story. I really like my pistol shrimp, and I even plan on getting another for my 12 gallon reef tank, but be warned. They're carnivorous!