Who are the ones zooming by?
No idea, unfortunately. I cleaned my nep water trays today, so I took a blob of the tray slime and stuck it under a coverslip. There're tons of little critters in it. Here's a video:
200x, Here's a still image of one of the zoomy things in case anybody knows what it is:
It moves extremely quickly. It has cilia along its length that it uses to swim, so it doesn't move the way something like a nematode/worm would.
200x, Here's a different unidentified worm-thing:
You can see one of these at 4:29 in the video above. This one's got an obvious pharynx/gut so it's multicellular. It has small tufts of hair along the length of its body so maybe it's a segmented worm of some kind? It has a cluster of red cells anound its anus. No idea TBH.
Some of the things I can sort of identify:
200x, 2x Chaetonotus and 1x Paramecium:
200x, A nematode and a ciliate of some sort.
200x, Another ciliate of some sort:
200x, A nematode (left), a heliozoa (top middle) and a long reddish paramecium (right).