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All aquariums tend to grow algae.
This is just a fact of biological life. When small amounts of water are kept in one place, algae grows. So, it is no wonder that every aquarium has a certain amount of growth which comes back no matter how hard you try to scrub it. In this article, I'll give you a little bit of an idea of what promotes algae growth, and how to reduce it. The number one reason for large amounts of algae growth is poor water quality.