Is this algae

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Newbie1

Newbie1

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I have this red/copper tint on some of my rocks. What is it?
21B4440F-838A-4D91-9442-D3DC9484AC90.jpeg
 
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andrewey

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Can you take a daylight/white light only photo?
 
vetteguy53081

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Appears to be Cyano or coraline. Cyano will blow away with a turkey baster wheras coraline will be calcium like hardness
 
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