About 8 months ago I purchased a small yellow goby and a pistol shrimp as a pair. Upon entering the tank together, each went their separate way never to be seen again. This was at least the 4th yellow goby I've purchased for this tank. In most instances, the very next morning they're dead. I assumed the same happened to this one. Yesterday I saw a mysterious cloud of dust coming from underneath a large rock. The pistol shrimp appeared to be making a new home. A few minutes later I saw that long lost and never fed yellow goby right by its side. I couldn't believe it!