Smooth talk

H-C6179

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Morning, reefers

Can anyone tell me what this smooth stuff is? the dark patch. Rubs off easy, always comes back in the same place after a few days no where else on rock Cheers

84f6edd8-1455-4446-b206-e0d9a02902d9.jpg
 
Morning, reefers

Can anyone tell me what this smooth stuff is? the dark patch. Rubs off easy, always comes back in the same place after a few days no where else on rock Cheers

84f6edd8-1455-4446-b206-e0d9a02902d9.jpg
Could be cyanobacteria.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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