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Time to update. As per your advises and other posts in the forum, I blacked out the tank for 3 full days (pitch black). After 3 days, to my surprise, all the cyanobacteria had gone without any visible trace. Just to make sure, I also treated the affected areas by hydrogene peroxide (3%). Then...

Thank you verymuch. I noticed that there are some gas bubbles attached to these green spots. Does it confirm that they are cyanobacteria? If so, no need to use terramycine?

Hello Mates, I am not sure if this is an alg or not? Some green spots (3mm-10mm diameter) appeared on the substrate 2 weeks ago. They are like paint stains on floor while painting a room. It doesn't seem like spreading (well this is how I observe at the moment). Some info about the tank: Tank...