If I watch the tank for a few minutes I will see them both. It is rare not to see them sometime during the day. The shrimp is continually mending the tunnels. Inside and out. The watchman is almost always at one of the tunnel entrances. If I make any quick movement he shoots into the hole. But is also protective of the entrance. He will chase my sixline or yellow tang with mouth wide open.
Well worth adding a pair to your tank. The shrimp does move alot of sand, causing rock, and corals (placed in/on the sand) to move.
Pistols/gobies are my fav's.
BTW I tried to pair the watchman with the red and white pistol shrimps, several times with no luck. He paired with the tiger almost instantly.
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