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Your tank is extremely nice. I love the pearling picture.

Do you have any fish or shrimp in the tank? They will probably help eat the algae.

You need a source a macro nutrients. These are nitrogen (usually dosed via KNO3), potassium (K), and phosphates (PO4). Usually known as NPK. Master grow adds almost no NPK. If you are not adding these that could be the reason for the algae.
 
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