Little white growth with hole in middle?

Naturalreef

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Just noticed these on my clams shell. Looks like a group of sponge?
IMG_1003.jpeg
 

Set it and forget it: Do you change your aquascape as your corals grow?

  • I regularly change something in my aquascape.

    Votes: 19 11.4%
  • I occasionally change something in my aquascape.

    Votes: 46 27.7%
  • I rarely change something in my aquascape.

    Votes: 78 47.0%
  • I never change something in my aquascape.

    Votes: 20 12.0%
  • Other.

    Votes: 3 1.8%
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