Rocks blacked out

[samVA23]

So my reef rock was white then brown coverd with ugly stage detritus then turend to black after adding algae barn copepods like a month ago, its not even scrupping with a brush, should i just leave it like that?

 

[Jason_MrFrags]

Have any snails or crabs in there to help clean it up?

 

[Court_Appointed_Hypeman]

What is that black? I have some on a rock and was wondering what it might be.

 

[samVA23]

Have any snails or crabs in there to help clean it up?

yep, snails and hermit crabs in the tank

 

[samVA23]

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