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Chad
The aquarium size is 48*36*40 cm in height. Equipment: Hanging filter 600 l/h. Protein skimmer Resun SK-05. Light: 6 pieces of 15 watts. Help me decide on the substrate. 10 liters of used coral gravel, live rocks I plan to get 5 kg (please suggest a phone number). I read for a long time and wanted to set up a 300-liter tank, but I decided to start with 69 liters. I really hoped that I wouldn't be bothering experienced aquarists with silly questions. But it turned out the opposite; on the third day, I faced a problem for which I couldn't find an answer online. Here is the problem, or maybe it's not a problem? The skimmer is producing green liquid... What could this be?