Hiya,
I got a tiger pistol shrimp and his partner a barber goby a week ago. The shrimp went right to work building a new home within seconds of putting him on a pile of rubble. The barber paired up with him within an hour. I went to bed that night and the silly critter had tunneled under my rockwork and caved it in!!! I was afraid that they'd both got squished. I'm happy to say that last night I saw my barber goby out eatting. I haven't seen the shrimp, but I'm pretty sure that he's still around since I see little puffs of white clouds every once in a while.
Kim/Meadbhb