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Daniel8015
The problem is as follows: There is cyanobacteria on the sand (the photo is old - it's less now). The aquarium is 94 liters, and the water is reverse osmosis + resin - TDS is zero. Nitrates and phosphates are also zero. There is an algae scrubber, duckweed, and 40% monthly water changes. 10 liters per week. Using marine salt. Lighting is 12 hours. Constantly using30-50 grams of activated carbon. I do not add any chemicals or additives. There is a small amount of cyanobacteria in the algae scrubber, but it goes away when I turn off the light for 2-3 days. I shaded the aquarium for a day, but the cyanobacteria remained the same. It is also different from the cyanobacteria in the sump - it is quite difficult to scrape off the sand with a fingernail. There is no cyanobacteria anywhere else. I did not measure silicates and did not add anything like red slime removers. What am I doing wrong, and how can I