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H-C6179

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
 
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Dan_P

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H-C6179 said:
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
Click to expand...
Could be cyanobacteria.
 
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