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The main causes of algae are typically excess phosphates, excess light, or poor water quality. Lights should be on no more than 10 hours a day, and the water needs to be maintained. Healthy tanks might have a very thin layer, but not one that grows quiclky.

Depending on how long you have your lights on, it might be a good idea to cut the time down a little bit. That used to be the problem with my tank.
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