Green algae?

jman9331

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Trying to figure out what this green algae is growing on the rocks. Been like this for a month and continues to become greener.
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Tahoe61

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The initial phase of coralline algae.
 

Tahoe61

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It is flouresent green than coralline, about a month or so until you see purple spots. If not flouresent green than a film algae, harmless and beneficial.
 

mike007

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Nuisance algae such as this is caused by excess nutrients. This is not coralline. Reduce your feeding and test your nitrates and phosphates.
 

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