My tiger pistol shrimp must have been eating them. I had bristle worms, then got the tiger pistol and did not see a worm for all of the years I had it. After it passed I started noticing them again and now a year later I have tons of them. I'm not sure if mine was an anomaly or the norm for eating bristle worms.
HTH,
Tom
Ya think I could house 2 pistol shrimps? I already have one paired with a goby.