Microscope ID: can anyone identify these?

[Krilla]

Hi I took some samples of the brown algae starting to cover my rocks and sand. I found 2 different shapes which both are moving. Can anyone identify these?

 

[Krilla]

Here is a video. Not sure why it’s not playing after I post.

 

[kartrsu]

First one is diatoms. Second one I want to say are amphidinium dinos. Can't see the video, but do they move like roombas?