How to get rid of carpet algea

Well, we can only guess what it is based on that description. It may be cyanobacteria. There are not easy "buy that fish" solutions. Reducing nutrients (nitrate and phosphate; by skimming, growing macroalgae, using GFO phosphate binders, etc), reducing organics (skimming, carbon, ozone, etc), and increasing water flow all help.

These articles may help:

Phosphorus: Algaeââ"šÂ¬Ã¢"žÂ¢s Best Friend
http://www.advancedaquarist.com/issues/sept2002/chem.htm

Nitrate in the Reef Aquarium
http://www.advancedaquarist.com/issues/august2003/chem.htm


Iron Oxide Hydroxide (GFO) Phosphate Binders
http://reefkeeping.com/issues/2004-11/rhf/index.htm
 
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