Filamentous growth on sand

8galdorm

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There is this filamentous growth on my sand during the day that is not present at night and when I turn the light on initially in the morning. What could this be
 
For some reason it won't let me upload it, its a red-purple color
 
Sounds like either Cyanobacteria or dinoflagellates
 
Might just be a Filament Algae.
red-hair-algae-b.jpg
 

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