What is this brown algea stuff?

[Fish_Sticks]

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

 

[Fish_Sticks]

Its the brown yellowy stuff

 

[ScottB]

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.

 

[eag]

Looks a little slimy.

I don't think diatoms normally look slimy...? The alternative is dinos

 

[ScottB]

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.