I've got a nasty bearded fireworm in my tank that took out my coral banded shrimp.
Here is a great link for info on them:
The best thing you can do, IMO
, is take the rock out and dip it in freshwater. This will unfortanetly kill most other things on your rock, but I might have to resort to it soon. Either that, or pick it out with tweezers or something. Be careful though, they will sting you.
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