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The video was filmed at the request of the viewer. In an aquarium awaiting a restart, I managed to film and show a green coating on the glass. This is a single-celled algae called protococcus. I am trying to tell you what it is and how to get rid of it in the video. I would like to add something I forgot to mention in the video. In high-tech aquariums, where fertilizers are added daily and CO2 gas is supplied, it is also possible to combat protococcus by allowing it to go through a full development cycle until it is completely completed. In this case, we do not stop supplying CO2 and fertilizers, but only stop changing the water and limit the supply of microelements by 25%. In this case, the algae should also die after completing its development cycle in three to four weeks. And we also remove it mechanically after it turns white and with a siphon with a water change.