Algae ID please

Scud

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Just want to know what type this is. I’ve been going back and forth about it. Thought it was Dino at first, then Cyano, but now I’m not even sure. It comes and goes almost daily. I have a short photo period, maybe 6 hours total. Lights are kept at 50% blue, 10% white. Nutrients are coming up zero- even when I over fed for a number of days.
Just want to know what everyone thinks it is. So I can find the best way to combat it. Seems to disappear during the night, only to start showing up towards the end of the light period.
its long and stringy, doesn’t seem to mind flow. Reddish maroon in color- some bubbling, but not much.
Thanks in advance everyone!

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