I finally got something!! Here are links to 3 new videos I was able to get after the lights of the tank were on this morning.@Mary Carmen
These are dinos. Either prorocentrum or an amphidinium. I'm not convinced yet they are a big issue. See CUC dying?
Best way to sample what you are seeing for microscope might be to suck up the strings that you see on the sea whip etc.
Thank you!
@Scott b and @taricha