Algae or bacteria on my sand

didou

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Hi,
I have a 1200 Liters mixed reef tank (with fish), since a few weeks there is algae or bacteria on my sand, it's only on the left part of my tank.

There is a small area where the algae is green, and another area where it's brownish/red.

My parameters are stable from the last 2 months and here are my results from the last ICP test (1 week ago) :

Salinity - 34.2
Kh - 7.6
Phosphate - 0.10 (a bit high, usually around 0.07)
Nitrate - 6.7
Calcium - 419

Can someone help me identify this for me and what can I do to get rid of it ?

Thank you

IMG-20241227-WA0010.jpg IMG-20241227-WA0009.jpg
 
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didou

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It's worse now, how do I treat this before it goes out of control?
 

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