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Discussion Starter · #1 · (Edited)
a variety of algae or fungus grows on my rocks, but hasn't really spread to my plants....yet...thankfully. can anyone help me ID this stuff?

more pics:

the algae circled in red :

the algae circled in green :

the algae circled in red is black and grows in small pieces on the rock. this stuff grows abundantly on the rock where there is a flow directed towards it, but doesn't grow as much on the rock without a lot of flow.
the algae circled in green grows in various small dots and seems to be furry.
the algae boxed in yellow grows in a dense sheet along the back of a rock where there isn't much flow. it doesnt grow long either.
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