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Hi Laurent: With that much hair algae you might want to consider taking the rocks out and claning them with a hard bristle brush in a bucket of saltwater. The algae contains alot of nutrient that will leach back into the water when the agae dies off. I've used this technique several times with success. In fact, live rock that is not fully cured can be cleaned in this manner. Don't work about hurting the rocks - they will maintain the healthy bacteria. After cleaning, return the rocks w/ lights off for a few days.
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