What causes brown algae to grow in a freshwater aquarium?

Algae most common home: question by another man with a strategy ......: What causes brown algae in a freshwater aquarium grow I maintain my tank quite properly I have a water change of 25% per week, I also use a gravel vacuum to take water from the tank and clean the gravel. I tried a couple of distinct kinds of algae cleaner, but it is not operating. I have better final results if I just rub the glass. ?. What can I do to remove the algae I also clean the filter each and every month (the

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