Any know what this Hitch hiker is?

I have them too except the one in the sand by the corals pic (last pic) they just come out at night and stretch out their hole and eat ditriuos and stuff ,they don't hurt nothing or explode in population I have 2 of them and they haven't multiply or hurt anything just worms , donno bout that last on though hes abit different
 

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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