I got a yasha goby and candy pistol shrimp on Wednesday. They spend a few days in an acrylic box in the tank so that my 6 lined wrasse leaves them alone. Today I added them to the main tank, and they stuck together! I have no idea why though. The shrimp decided it's too lazy to make a burrow and is living in a shell. The goby decided that wasn't an issue and joined him. The goby hasn't left the shell even when the pistol shrimp ventured out for building materials, so the goby isn't acting as a very good lookout. I don't know what each one gets out of this relationship, but hey. I'm not complaining! Feel free to give me some name suggestions!