Help ID strange white substance on live rock

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Sid996

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anyone have any idea what this strange white stuff is on my rock ? and should I be worried

cheers

IMG_20260413_180637014.jpg IMG_20260413_180633584.jpg IMG_20260413_180620272.jpg
 
Likely sponges or tunicates (I'm thinking tunicates). They're filter feeders and usually not a concern unless they're encroaching on corals.
 

WHAT KIND OF SUBSTRATE ARE YOU RUNNING ON YOUR TANK?

  • Bare bottom

    Votes: 5 29.4%
  • A shallow bed of fine sand

    Votes: 3 17.6%
  • A shallow bed of coarser sand

    Votes: 3 17.6%
  • A deep sand bed

    Votes: 2 11.8%
  • Mixed substrate or varying sand depth

    Votes: 4 23.5%
  • Some other substrate (posted in the comments)

    Votes: 0 0.0%
  • I don’t have a reef tank yet

    Votes: 0 0.0%
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