What is it

aerialdronemaster

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can you guys tell me what is the brow, dark brown something covering my rock is it ok to have it ?

20200713_133822.jpg
 

Erichk

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It’s kind of hard to tell from the picture but it looks like it might either be Cyanobacteria or dinoflagellates. I would look up some pictures and try and compare to your tank to see what it is
 

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