One of my wonderful teachers had trekked out into the Palo Alto Baylands and collected a silt sample for us to examine in class. After straining the silica out of the sample and preparing a slide, I inserted the slide, attached the light to the backside and used a coupler to center my phone over the lens. I was overjoyed to see a bunch of fast-swimming protists darting between particulate matter. If you know anything about the species, do not hesitate to comment. Thank you.
Also check out the full video of them: