Has Anyone Seen These Before?

dudleyedd

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These guys just appeared in my anemone tank. Some are swimming, some are stuck to glass. Looks like they have 8 appendages and some sort of “head”. Only other occupant besides nems is one clown fish. Tank is 2-3 years old. No new rock added recently.
3A688D03-D8B0-4413-81B8-FAA77DC20400.jpeg
 
Those are hydroid (hydrozoan) medusas, possibly Cladonema sp. I have seen two other threads with similar ones:
 

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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