The only concern is that is the goby jumps or not. Personally I am not sure i they jump or not.I'm hoping this thread stays alive a little longer as I'm in the same boat. From the research I've done, a shrimp goby with a pistol shrimp makes a great match. They have a symbiotic relationship that seems very interesting to watch. You can find videos on youtube showing this. Pretty much the shrimp is nearly blind so the goby watches out for predators and keeps the shrimp safe while the shrimp digs out a burrow and keeps it clean. The only problem I know of is that most gobies are known to be jumpers. Is that true? I would really love to own a pair like this but my tank isn't covered. What do you guys think?