What is this brown algea stuff?

Fish_Sticks

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Friend sent me this asking for an ID... what you think, cyano, or some kind of diatom? Looks a little slimy.

Screenshot_20201207-140454_Reddit.jpg
 
Its the brown yellowy stuff
 
Just new rock uglies -- likely diatoms. Then they will turn rusty reddish as cyano starts in. Then some brown stuff, then green stuff and finally 6-8 months some pink circles. All natural maturation phases.
 
That rock age is defined in... days? Weeks? A month? It is young so ID is not important as the organisms will change in a couple of weeks. All good.
 

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