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.
 

WHICH PART OF YOUR SETUP IS HARDEST TO REACH OR REMOVE FOR ROUTINE MAINTENANCE?

  • Glass behind or beside the tank

    Votes: 6 31.6%
  • Powerheads or wavemakers

    Votes: 2 10.5%
  • Sump or rear filtration chambers

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  • Skimmer or other filtration equipment

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  • Overflow or plumbing

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  • Lights or lids

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  • Mine is pretty easy to access!

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