Is this cyano?

Sweet Freddy

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In the past if I got it it would be on sand bed and slimy hairy looking but this is not. Its only on my rocks thru out the tank.

20210122_164009.jpg 20210122_163955.jpg
 
Hers a way to tell:
Take a turkey baster and give it gentle blasts. if it falls apart in little sheets- Cyano. Hard to tell as pics are Very blue
 

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