Teeming circle of mystery

[Jerradin]

I can't figure out what I recorded here. The movement could be organelles, bacteria, or just Brownian motion - it's pretty small.

https://www.youtube.com/watch?v=8AwVZouJGS8

Here's an image with a scale bar, since I haven't figured out how to add those to videos in ToupView yet. In this image, it does seem to have a nucleus that wasn't so visible in the video.



Anyone have any idea what it is?