[Yes, I had one for a few years, and recently got a new one. They are adorable, but don't do well in a tank that has many fast moving fish at feeding time.
My avator is a picture of "Guppy". One of my favorite fishes I have. The species I have is commonly called yellow goby, Gobiodon okinawae. The Clown Goby usually refers to the gobies with some white stripes along the eyes and gills. The scientific name for this type is Gobiodon citrinus. Like Hawkfish they lack a full swimbladder and that is why they perch. The yellow goby like I have lives among sps corals in the wild. As you can see from the pictures I have provided my goby with a M. digitata forest for him to hide in. Mine is very bold at eating and if he ever feels threatened he just hides in his little home.