green moss alge

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ok guys i am posting a picture here of thick moss like alge now could anybody advise here as to why is this growing so thick and dense

moss alge.jpg
 
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viper357

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That looks quite wavy, possibly just normal GHA (Green Hair Algae), is it like grass, very thin individual single strands?

If it's just on the one rock then I would remove that rock and treat it separately, but would ideally need to know Nitrate and Phosphate levels if possible.
 

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