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Vitor

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Just came back from a 2 week vacation. Noticed these two things. On sand what I thought were diatoms now I am second guessing myself as I see these hairs. And this morning before lights on noticed these bubbles. Does this mean Dinos?
Thanks!

IMG_5559.jpeg
 

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Vitor

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Low nutrients. Nitrates 5, phosphates 0.02.
Kh 9
Ph 8.2
Magnesium 1260
Calcium 440
I try here to attach the video again
 

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