Redish purple algae growing hurting my star polyps

Noticed this starting to come around and getting worse now it has completely taken over a area were my star polyps are and they won't come out now some one please help me get rid of this any suggestions tried uploading a pic but said file to large
 
Do a search on this site for cyanobacteria, also called slime algae. There are several posts on identifying it, and getting rid of it.

David
 
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