Hey i purchased this acan last week and over last few nights have noticed black and white tentacles sticking out from below lr it came on. Any ideas? Im guessing its a worm but if its another coral il break it off and move it.
Looks like a brittle star. They are everywhere in live rock and sandbed. They are great to have and come out when you feed. you will have hundreds soon. Good clean up crew. They don't get very big. Reef safe and welcome addition!