I've been googling for over an hour trying to figure out what this is, but I can't for the life of me figure it out. It's a new tank, barely 2 1/2 weeks into starting it. This has shown up and maybe I'm crazy but it seems to be slowly growing/spreading. I don't know how to even describe it so hopefully pictures help. It's the brownish/grey spotted mass that's on the rock.
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