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KathyC

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Ok, I see them now AND I remembered to turn down the volume before I leaned in closer to the computer..lol

No, that isn't cyano, it is a type of algae.
Since you don't have very much of it, it should be easy to remove it from the rocks manually, just be sure to get all of it off of the rocks, all the way down to it's base.

Where did you get the rock from?
 
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