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Old 12-01-2013, 07:29 PM   #1
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Black mold on rocks?

Hey all -

Rocks are starting grow some strange black like mold.

Established tank. All tests are good. Phosphates as well.

Also, noticing some algae on sand bed. Maybe cyano?

Any help - thoughts?

Many thanks
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Old 12-01-2013, 07:38 PM   #2
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I get it every once in a while and I still don't know what it is but when I do PWC`s it easily siphons off the rock.
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Old 12-01-2013, 08:48 PM   #3
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Thanks man.

This stuff is pretty stuck on there. I just tried to scrape a bit off - and not much moved.

Eeek.
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