dinoflagellates id

[chevegan]

This is the best I could do with a kids microscope and a phone. They disappear every night and are mostly on my sand with some on my rocks at times

 

[XNavyDiver]

This is the best I could do with a kids microscope and a phone. They disappear every night and are mostly on my sand with some on my rocks at times

I'm no expert, but this is all I've been reading about lately because I've got an issue in my own tank. This acts exactly like Ostreopsis dinos. That signature pinwheel movement.