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
 

Ingenuity against algae: Do you use DIY methods for controlling nuisance algae?

  • I have used DIY methods for controlling algae.

    Votes: 31 53.4%
  • I use commercial methods for controlling algae, but never DIY methods.

    Votes: 12 20.7%
  • I have not used commercial or DIY methods for controlling algae.

    Votes: 12 20.7%
  • Other.

    Votes: 3 5.2%
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