They are very common in the aquarium hobby and grow more when the nutrient levels in the tank ( Primary Nitrate and Phosphate ) are a bit higher. They are not harmful and can be easily removed just by cleaning the glass ( Our Clown Fishes love to eat it, when we clean the glass towards them :)).
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Another way to reduce the nitrates in the water are to introduce macro algae into the marine aquarium, which can outcompete unwanted micro algae and therefore reduce the need of cleaning the glass manually.
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