Please help me with identification

Hunter_87

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The aquarium is 880 liters. It has been in operation for a year. This has been happening for the last month. I submit the pictures below. From coral only soft. And the fish has two tangs, two clown fish, bird fish and a small trigger niger.

20220420_181645.jpg 20220420_181648.jpg 20220420_181655.jpg 20220420_181703.jpg 20220420_181713.jpg 20220420_181720.jpg 20220420_181735.jpg
 
Cyanobacteria.
Manual removal is important as most inverts won't touch it; siphon as much as you can off the sandbed and blow it off the rocks with a baster (siphon this out as well or catch it in a fish net)
Cyano thrives in low flow; increase flow to the areas you see it form.
Nutrient imbalances can contribute to cyano; please post your nitrate and phosphate values.
You said the tank is a year old; have you added any new dry rock lately?
 
I did not add dry rock later. Parameters are: NO3 - 0.2 ppm (Salifert), PO4 - 0.009 ppm (Hanna)
 

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