ID for green gummy worm on snail please

[Starkrost]

Hi all. My Trochus snail has 2 of these ride-alongs. I never see it actually do anything so maybe it’s some kind of algae? Thanks!!

 

[vetteguy53081]

Looks like it's a nemertean work AKA, Notospermus tricuspidatus. Its a predator worm rthat feeds on small organisms like other worms, small crustaceans, nudibranchetc. It won't touch your corals unless it's crawling in their area but harmful to inverts once it gets to their flesh. Pick them off with a paring knife into toilet of you can

 

[Starkrost]

Gross!!! Thanks and will do.