Is this Cyno?

CedricT

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Hi guys. What is the pink purplish thing in my rock? Is that Cyno?

20200120_124733.jpg
 
Last week water change I siphon it and it came out some. This week grow back again. It look like soft type not hard as coralline algae.
This red stuff came out I think was 3 weeks ago.
Last month I change 2 things
1) I change a new LED light
2) One of my anthias when missing so I added active carbon but is those cheap type.
 

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