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It's a growing pain of new.aquariums. just about everyone gets it at first. Your best bet to get rid of it would be to limit your lighting down to 6 hours a day and just wait it out. The diatoms feed off of excess silicates in the water.
If you have a planted tank you might get a small school of otocinclus. They will clear your tank of brown algae in less than a week. They will eat other algae, too, though they also need to be fed blanched vegetables like zucchini in most cases.