Oh sh*t, really unpleasant guest in fish tank. I understand you, I had one of them in my aquarium. He was so scary. I didn't know what to do, because I have read that they can be inside their caves for a lot of month, but to find the entrance of them, is reareally difficult. You are lucky that you did it. However, to kill it, is also not the easiest action. In internet there are really few advice and most of them don't work. I tried to caught bristle worm with hands, but got zero result. The my friend recommended me to order coral cleaner. It really helped me to kill these creatures
Last edited by StewartKerr; 08-30-2020 at 05:27 PM.