alge growth

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Light and a food source.

If you can provide some more information about your tank then we can dig a bit deeper; size, how old, water params, filtration, pwc schedule, how cycled, food types, inhabitants, etc
 
That could be one of the reasons. How long to you run your lights? How old are they? How old is your tank? What type of substrate? how many fish? tank load, total fish , corals, inverts As you can see many factors can promote algae growth.
 
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