Oh yeah, for the pistol shrimp, i think you should go with a Tiger Pistol Shrimp. I have one and i tell ya, he looks awesome. They burrow EVERYWHERE. I can see that the sand is perfectly flat in one area today, and the next day there's a huge mound of sand in that very same spot. He is awesome. Pretty cheap too. The clicking is pretty loud also. You can definitely hear it over everything else running on the tank.