I had this exact same thing and it just sort of went away on it's own with regular maintenance and water changes. Never was able to find exactly what it was, but it definitely looks the same. It never really took over or moved to new area after I spotted it.
Yep, I had it too about 6 months into my tank running. I used BRS Eco Saver rock and that stuff covered every rock surface. It eventually faded away and I figured it was just a part of the rocks maturing.
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