Is this critter good or bad?

Fifty8reef

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F5A572BF-67DC-4A8B-9D8F-57FDF8C6AF25.jpeg
04E32260-2982-4335-A13A-5A1A2F7129B7.jpeg
Sorry for the bad quality of photo. Its in a dead spot of my aquarium. Can anybody identify the shell looking thing in the the photo. It was opening from the top but closed as I was taking the picture.
 

Creating a strong bulwark: Did you consider floor support for your reef tank?

  • I put a major focus on floor support.

    Votes: 53 40.2%
  • I put minimal focus on floor support.

    Votes: 27 20.5%
  • I put no focus on floor support.

    Votes: 48 36.4%
  • Other.

    Votes: 4 3.0%
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