What is this? They are about the size of a quarter.

[Whiterabbitrage]

 

[shakacuz]

perhaps a Cirratulid family worm

 

[Whiterabbitrage]

Thank you! I had no idea. I was thinking it must be a parasite. Thank you for sharing your knowledge.

 

[shakacuz]

Thank you! I had no idea. I was thinking it must be a parasite. Thank you for sharing your knowledge.

it possibly could still be. i would wait for the input of other members to see if i was wrong or not

 

[ISpeakForTheSeas]

perhaps a Cirratulid family worm

Seems right to me - harmless/beneficial:

Looks like either a hair worm (Cirratulidae) or a spaghetti worm (Terebellide) to me - if the tentacles all come out from a single point, it’s a spaghetti worm; if they come out from basically all over the body it’s a hair worm.

 

[Whiterabbitrage]

Thank goodness the Prazipro didn’t kill them.