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Black Algae in a fish tank isn't actually algae at all. It is bacteria protein called cyanobacteria. If your asking how to rid your tank of this, the first thing you'll want to do is test your water for nitrates and phosphates. Generally this is a major factor in the growth of the bacteria. Scrub the glass, clean the decor, and stir the gravel. Remove as much as possible with a net. Next perform a 25-30% water change. This will help reduce the levels of nitrates and phosphates. Also, since this type of bacteria has to photosynthesize reducing the amount of time the light is on will be greatly beneficial.

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