I have a Pink Spotted Watchman that pretty much just hangs out near his rock. He's pretty, and doesn't dig except for the sand behind his rock. Hasn't paired with two pistol shrimps I've tried so far, but I believe that is unusual for them.
The "reason" gobies and pistol shrimp form a commensal relationship is that pistol shrimp see poorly, if at all, and gobies cannot dig homes. No pistol shrimp, no mess.
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