Goby Question...

Well, when going by liveaquaria.com's suggestions, gobies may attack other gobies in small tanks. Maybe if you had a mated green clown goby/watchman goby? Not sure. I'm sure someone will chime in :)
 
Go for it. Those clown gobies can take good care of themselves, and it will probably establish itself in a different area of the tank than the watchman (upper tank vs. sandbed).
 
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