Black Patches on substrate

forsaken · Post by **forsaken** » Sat Feb 25, 2017 2:43 am

Anyone know what these black patches are? Started forming a few weeks ago

Rod the Reefer · Post by **Rod the Reefer** » Sat Feb 25, 2017 3:55 am

Are they firm on the rock or can you brush it off?

There's a nice crop of Aiptasia there though.

Rod. :thumbsup:

forsaken · Post by **forsaken** » Sat Feb 25, 2017 8:40 pm

Its soft so you can brush it off.. yeah the aiptasia seems to come and go... a few weeks back i had none of it..

Rod the Reefer · Post by **Rod the Reefer** » Sun Feb 26, 2017 3:21 am

I'd say cyano then. How old is the tank? What are your params?

Rod. :thumbsup:

Ageofaquariums · Post by **Ageofaquariums** » Sun Feb 26, 2017 4:26 am

Have to agree its a bit cyano looking. Phosphates might be creeping up in ratio to nitrates.

forsaken · Post by **forsaken** » Mon Feb 27, 2017 11:42 am

Just checked the parameters... nitrates 0, phosphates 0, HR ph 8, KH - 5
Seems my kh has dropped quite a bit in the last few weeks so will start dealing with that

The tanks about 2 years old...

Sailfin · Post by **Sailfin** » Mon Feb 27, 2017 10:36 pm

And the winner is cyano :nod:

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Black Patches on substrate

Black Patches on substrate

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