vermatid snail

Hope everyone is doing well , just wanted to get your opinions. I took a very long break from the hobby and recently got back in about a year ago. since then , I have spent nearly 5 figures with a large/popular company that is supposedly quarantining their corals in an attempt to be pest free...

I've noticed alot of these white stringy worms flowing off my Shaving Brush Macroalgae. They seem to fit the description of Vermatid Snails, but I don't see any shell or body at the base–only little white specs. Could they be in a larval stage? Or something else? Also, is it irritating the...