Small Skinny Worms on Euphyllia Skeleton

[Nitrites]

Hello Reef2Reef,

I was looking at my corals today and noticed my euphyllia has very tiny skinny worms crawling around the skeleton of some old closed up heads. The rest of my coral has looked great all year, but I just noticed these little guys. They are about the length of a grain of rice or a bit shorter, and there are quite a few of them crawling around. I don't think they are harming the coral but I am curious as to what they are and if they might be doing damage slowly. The heads they are crawling around on have been closed for months, and I assumed they closed because of lighting or something else as the rest of the coral is doing great. Any help is appreciated, thanks!

Video Attached, there are three worms I could spot in the video, one swaying in the current, one climbing into a hole in the middle ish, and one on the left side of the coral.

 

[BriDroid]

I see those exact same worms on my glass from time to time. My damsels will eat them, but I have no clue what they are. I have read other posts where people say they are harmless, but I don't know for sure.

 

[bluemon]

Probably something like a Spionid worm,

harmless