I have had a tiger pistol shrimp and Randal goby pair for around 4 months. Not a long time but so far the 2 have been great in the tank and haven't caused any issues. They do burrow all around the tank and you will want to make sure all rock will not fall over because they will create tunnels directly under the rock. Very cool relationship although you will not see them everyday as they do spend quite a bit of time in the burrow but when they're working it is extremely cool and everyone I have had over has enjoyed watching them.
Also note they seem to be really shy so any movement in front of the aquarium or even fish movement in front of them will drive them back into there burrows.
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