goby for 30 gallon tank

if you don't have any fish that would be a danger to shrimp, you could do a goby/pistol shrimp pair.
 
Best would be a sandsifter that also eats pellet: the yellow watchman is good at both.

One thing to avoid, the so-called Mandarin Goby, which is not a goby, but a dragonet, which requires a mature fuge support system and at least a 50 gallon tank.
 
I have a Yellow Watchman Goby/Pistol Shrimp combo and they are a hoot to watch. I've had them for about two years and the goby is still pretty small. Every couple of months they move to a new area of the tank, very entertaining guys.
 
Gobies are great for smaller tanks. Keep in mind I wouldn't get a sand shiter if I had crushed coral for my tank.
 
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