weird worm 2

I had that in my tank at one point as well. Still never found out what it was. I would just see this dark green worm looking thing extend from one hole onto other rocks to collect detritus and then just retract after a few minutes.

possible spaghetti worm

I have the same in my newly aquired live rock but it is white. i think is a spaghetti worm, hermits and snails apparently prey on them.

medusa worm