Dark green spots on rock

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wd2424

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is this green coraline or something else? Doesn’t seem to brush off easily

A8F259EF-BC92-4BAD-9668-692DFA05FC1D.jpeg
 
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wd2424 said:
is this green coraline or something else? Doesn’t seem to brush off easily

A8F259EF-BC92-4BAD-9668-692DFA05FC1D.jpeg
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Looks like film algae but best determined under white lighting.
 
Would film algae not brush off with a toothbrush? I’ll try and get a picture under white light
 
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