Is this a beneficial worm?

[Gyarados]

So all my Euphyillias seem fine except my green branching frogspawn. I inspected and found a big circular worm attached to its skeletal base. I know I have many Spirorbid, but this one is bigger and different color with two tentacles/feelers. I couldn’t find the I.D online so I thought I’d ask around if this thing is Reef safe?

 

[blaxsun]

Pretty sure you don't want it (wasn't able to get a really good look, though).

 

[ISpeakForTheSeas]

That kind of looks like a giant vermetid snail with a mucus web out to feed, but it's hard to tell with the pics. If it is sending out a mucus net, then it is large vermetid species.

 

[Gyarados]

I’ll try removing it and see whether that was the reason. When I remove the worm/snail should I also remove the Spirorbids? What you guys think, do they affect the calcium carbonate the coral intakes/builds?

 

[vetteguy53081]

Its likely a vermetid that can get large

 

[ISpeakForTheSeas]

I’ll try removing it and see whether that was the reason. When I remove the worm/snail should I also remove the Spirorbids? What you guys think, do they affect the calcium carbonate the coral intakes/builds?

The Spirorbids are harmless, but you can remove them if you want - they do use some calcium carbonate for their tubes, but I don't know if it would be a meaningful amount.