Dino ID and Treatment help

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Alanc425

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Hello all,

I’ve been battling dinoflagellates for a few weeks and finally got some clear microscope shots. I originally thought I had two different species, but looking closely at the cells, I suspect my entire outbreak is just Ostreopsis? I am a bit thrown off because they don't really spin in one spot but move around a bit and have a center structure.

In the overflow there's thick, fibrous, golden-brown strands (1"+). A 48-hour blackout didn't phase them at all.

On the SPS and frag rack: They easily blow off with a turkey baster but reappear quickly, and they tend to recede slightly at night.

Can anyone confirm this is definitely Ostreopsis? and UV is the best way to tackle this?

Appreciate any input on the ID!

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