Ewe. What is this guy?

harmless spaghetti worm i think
Spaghetti worms usually have red or orange tubes or tentacles.
I don't know what type of worm/filter feeder this is, but it looks like it may have lost its tube.
 
Ew Marie GIF by NETFLIX
 
It is some form of Sea Cumber like the Indo-Pacific Spotted Worm Sea Cumber.

1646374035831.png
Looks like a type of Medusa worm
Agreed, the OP's creature appears to be a type of sea cucumber, like the Medusa worm. These are detritivores that can multiply rapidly and poison tanks when they are stressed.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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