At approximately 7:30pm on Monday, April 8th, a water sample was acquired from the Caltech turtle pond and brought back to Broad in a small plastic container. The sample was then dispensed onto a glass slide and viewed through a Foldscope. An iPhone camera was used to obtain the above images of the sample.
I looked at a few different samples (taken from different areas of the pond, at approximately the same time,) and did not find anything moving in any of them. This combined with the fact that the specs I saw were all fairly opaque leads me to believe that sadly, I only saw dirt. To confirm this, it would be worth examining the sample more closely under a more powerful microscope, and looking at it for a longer period of time in hope of seeing some movement.