Fairy shrimp again! These are redtail fairy shrimp approaching adult size, most of them about 1.5cm long. The water is cloudy because that’s how you keep them fed, you make sure there are suspended particulates of food (yeast and algae) for them to filter out and eat. 

Also the old, hydra-infested tank. I think those must photosynthesize, they’ve been multiplying despite having no food in that tank. 

Video description and captions under the cut. 

[about a dozen small creatures are swimming in slightly murky water. The creatures resemble feathers with two black dots of eyes at one end and a slightly forked, red tailtip at the other end, and they swim around upside-down by waving a series of fine legs on their upward-facing bellies. They are swimming towards the surface of the water, where a light source is visible.]

“These are my fairy shrimp. Look how big they’ve gotten! Most of ‘em are over a centimeter long. Which is great, considering these things are born, like, a third of a millimeter long.” 

[camera pans back and forth to show the creatures, then lingers and follows a large one up the glass as it comes close.]

“Hello, shrimp. They’re in a different tank {referring to the fact that this tank is not the same as seen in previous videos} because the other one has hydras, which are little stinging things that eat these guys. And this girl-” 

[camera lingers on the largest shrimp, which has a tiny, pointed white pouch just visible behind the last set of legs]

“-this is big mama shrimp. You can just barely see she’s got a pouch full of eggs behind her legs, which the others don’t have.” 

[all the shrimp are now at the surface of the water, pressed against it and swimming slowly in no particular direction. One is startled by something, and jerks downward a few inches to get away, then slowly edges towards the surface. A few small round creatures are now visible, much smaller than the shrimp and moving in jerking patterns.]

“Still very attracted to light! As you can see here. Oop! Something scary happened, apparently. I got sixteen of ‘em, these are the ones that didn’t get eaten. There’s a daphnia, pretty much all the daphnia got eaten. But-” 

[camera zooms out to show the entire aquarium. It looks to be about a foot long and half that height, and is full of nothing but the shrimp, a vertically floating thermometer, and slightly greenish water]

“New tank, no more hydras. Old tank-” 

[camera pans to the side to show a slightly larger aquarium, this one with rocks, sand, and a clump of moss in it]

“-full of hydras! Like, I’m talkin’ hundreds of those things. Let’s see if I can film any.” 

[camera zooms in on the white sand, showing a few small, greenish creatures. The creatures are small, vertical, green stalks with a few tendrils coming off the upper end, and do not move. They are also anchored to a pink, speckled hunk of granite, and on the surface when the camera pans up to show that. Only a few are visible on the rocks and sand, but several dozen are attached to the surface.]

“Alright, you see those green lines in the substrate? Those are hydras. Those are the biggest ones, right there. More on the rock, aaand, here we go, those are hydras. They’re basically freshwater sea anemones. Aaaalll over the surface, all over the sand, all over the rocks. That’s why these guys are over here. But, hydras or not, they’re happy. And they’ve got eggs. Yay!”