dino or diatom id help

[monfilsi]

Can someone help IP this"

I'm finding it in high proportion along with diatoms and Large Cell Amphidinium in my battle again dinos.

 

[taricha]

I'm finding it in high proportion along with diatoms and Large Cell Amphidinium in my battle again dinos.

does it swim with a rotating sort of motion? it could be diatoms in the dividing process or something like this dino
https://images.app.goo.gl/mA1XQH6YRBkYHdMc7

 

[monfilsi]

Getting better at using the microscope...

Same organism.

I think it is a diatom with that clear geometric shape.