ID worm maybe?

[essengy]

Just added live rock a couple days ago and found about 4 of these things pop out of holes from rock. I thought maybe a kind of peanut worm?

 

[House of Laughter]

I would agree

Keep a close eye out for oversized flatworms - like larger than a quarter. They tend to travel together on live rock.

FWIW

House

 

[essengy]

thank you sir. i dont know if they are going to survive the nitrogen cycle as i saw one looking pretty dead this morning. Hopefully the cycle will kill off any potential flatworms as well.