They may have gotten beat-up by the peppermint I got. Spotted it ripping apart a 1.25 inch bristle worm, picking up and attempting to rip a vibex out of it's shell, and clinging onto and fighting with my clown over flake food. Must not have been an in-flight meal, that's one bad-mo-fo!
Glad that I didn't get too many cerths, those things dug deep in my sand bed almost instantly. Haven't seem um since. The vibex are fun to watch when the lights turn on in the morning.