Question Black Stuff On Rocks! What Is It?

Skullkong101

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What is this black stuff on the rocks? If wasn't there when I got them... Also I have no way of testing my parameters but guppy fry are thriving. (A guppy fry photobombed me if you look closey)
 

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Rtessy

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Can't really tell from the pic, possibly black beard algae?
 

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