I have Yellow Watchman in my 120, he lives with a pistol srimp. The two of them dig all the sand out from under my rock. I put ther the rock in first then added sand, so they should be safe. They will hide in the back of the tank for weeks, and then come out for weeks. They just push the sand around in one corner of my tank and make piles. My sand bed is 1" in the front and 3"-4" in the back.
I feed the reagler frozzen food and pellets. I don't think they will jump out of your tank.
A shy little fish.
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120 G sps reef, looking to build bigger. 
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