Any idea what this is?

Ojskeed

New member
My tank is four weeks old, covered in diatom and the red algae and I found this stuff growing at the bottom of the rock where it meets the sandbed. I just wondered whether it's something else to worry about?
 

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That's really helpful thanks. Can anyone tell me a bit more? For example why it's bad? What should I do to get rid of it? I'm a total newbie and was hoping for some help here?
 
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