Watchman goby tank size

[NewNanoTank]

So I have just finished cycling my tank and added a pair of clown fish. I really want to add a watchman goby and a pistol/snapping shrimp for their relationship. The only issue is a lot of fish retailers are saying the minimum tank size is 30 gallons. I have a 10 gallon tank with 3 pieces of live rock to form a cave. There are places for the goby and shrimp to burrow in the sand up under the rocks. There is also ample swimming room for a 10 gallon tank and my clown fish appear to prefer staying in the more lit up right side of the tank. Anybody have any opinions about adding a watchman goby to a tank this size? Thanks!!
Also how long should I wait to add another fish? I don’t want to wait too long for the clowns to get bigger and more territorial but I also don’t want to be too quick because I know the bacteria needs time to adjust to the bioload.

 

[reef_ninja]

With a 10 gallon tank, you might be pushing it a bit adding the goby/watchman pair. I can understand your want though, its a cool pair to have.

 

[stiffljp]

Watchman gobies get pretty big, you might pick a smaller goby like a yashi which will also pair with a shrimp