Some kind of worm?

[gls90a]

These "worms" are growing like crazy in my chaeto refugium.

I read thru the top few pages and the sticky but I dont see anything like this.
Sorry if its super obvious. My best guess is spaghetti worm?

 

[TriggerFinger]

That’s a really clear video! They are Medusa worms. Here’s a screenshot for those who can’t see the video.

 

[gls90a]

You nailed it. Thank you very much I am reading up on them now.

 

[Goaway]

Sadly, medusa is a filter feeder. And if they die can release a lot of toxins. Keep carbon going if you keep them.

I have had these before in an 80gallon system, and never had an issue with them. GL!