Reddish brown algae growing on sand

Rayb

Reefing newb
Hey guys have been in the saltwater hobby for about 2 months now.have had freshwater tanks all my life..so not to new to the fish tank hobby..my question is I have reddish brown algae growing on my sand how do I get rid of it..the tanks is 13.5 fluvial evo saltwater set up..also have a protein skimmer on it..
 
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