Unknown worm in fuge

[mastyrlock]

Hello all, I recently found a pretty large (3-4”) worm hanging out in my chaeto ball and I cannot id it for the life of me. It’s definitely not a bristle/fire worm as it has totally smooth skin. It is red with white speckles and extends prominent gills or filter feeders out of its mouth that resemble axolotl gills, it is very shy and I’m assuming nocturnal. When it extends its gills it resembles the demogorgon from Stanger things. Attached are a few photos but it is hard to make out the feeders.

 

[KJ]

Welcome to R2R!!! Medusa worm.

 

[mastyrlock]

That’s exactly it! Thank you.

 

[SHNICI]

Usually they are good CUC, feeding on detritus and small particulate matter. Just if they get stressed too much (are scared) can realise bad toxin.

 

[KJ]

That’s exactly it! Thank you.

YW.