I had same prob. Get 4 margarita snails. They love brown algae. Also get 2-4 turbo snails. Give them a week and algae should be under control. Also have you upgraded light or downgraded light any time soon. Also a skimmer is not needed in this small of a tank. what kind of filter? And how many GPH does it let out. make sure to change pad on it every 2-3 weeks. Also get a cleaner shrimp.
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