Extremely docile. I keep mine with a baby gold stripe, a tiny sixline (under an inch right now), a bicolor blenny, two green clown gobies..also tiny. He's also in with emeralds, hermits, a serpent star, a fire shrimp... He hides during the day, we NEVER see him, and when he does his laps at night ours shows NO intrest in anything other than scavenging; I believe they prefer to scavenge and aren't ones to catch or hunt other fish. I'd safely say they wouldn't hurt a thing. We call ours Shy-guy, just thought I'd throw that in. The emeralds get into more trouble than he does