I've been seeing this guy crawling on my green star polyp frag all day and am wondering if he is going to hurt the coral? They're all in right now because I took it out and tried to remove the worm with tweezers but couldn't catch him!
Thanks
It's a Bristleworm ... usually harmless and good addition to the clean up crew. However, if it appears to be going after corals {which is rare} ... remove it.
It is rare to see them out in the open in daylight. I would be tempted to put a little bit of flakes in the tank to avoid any potential of it nipping coral from hunger. I have a MASSIVE bristleworm that plows through the sand and it never has hurt my GSP, xenias, frogspawn, mushrooms or kenyas. I wish I could get a picture, but he looks like this only MUCH larger: