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Samuel6138
Congratulations to everyone! Such threads have appeared. I realized they are cyanobacteria. It didn't go away for about a month, and darkening didn't help. I bought the Chemiclean product. I followed the instructions three times. It helped for exactly one or two days. Then everything came back again. Please help identify and eliminate this nuisance. The water has 0 phosphates and 20 nitrates. Some corals are partially or completely closed due to these threads.