These are my two favorite animals in my tank. They are a tiger pistol shrimp and his best friend "yellow fish" a.k.k. the yellow watchman goby. The shrimp and goby have been paired from day one, about 1.5 years. The shrimp is an amazing tunnler. He always has a project, or major construction site. It is great fun to watch him move sand, small and not so small rocks, and coral...well moving the coral isnt so fun. He hid my favorite coral from me. It was a wonderful little green and brown plate coral that I grew from a small single tenticle to the size of a 50 cent peice. No more corals on the sand bed, I learned. These great creatures always provide an interesting show.