Cyano growing under sand only?

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Curious why I seem to have cyano growing in my sand bed but not on the surface. Is cyano growing below the sand surface anything to be concerned about?

IMG_20180509_124420.jpg
 
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I am curious too. Mine has the same. I had a few patches briefly in the main tank that went away, but the stuff under the sand seems to always be there.
 

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