Microscope pics - cyano, diatoms, dino ID help

[DeNovice]

If I need more quality pics let me know. I’m new to the game so can someone id this for me with what I’ve got? Can iPhones not upload videos to this site?

 

[DeNovice]

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[vetteguy53081]

Appears to be diatoms

 

[DeNovice]

Thanks. So if I have stringy brownish algae in places on the sand with no bubbles I should assume it’s a silica issue probably? I’m concerned because my nitrate and phosphate is undetectable. I only just cut back on the chaeto lighting a few days ago though so I assume that’s probably to blame if it isn’t dinos.