They look like scuds to me. Brine shrimp would not survive in fresh water very long. Personally, I think they are harmless fish food but some people may disagree.
You’re right they look a lot like scuds but red! Maybe they’re extra rich in beta carotene. Only thing is scuds usually swim smoothly and these tiny bois kind of jerk around like daphnia or copepods. Hmmm. In any case even the fry like eating them. Just wish they weren’t growing in my dirty lotus flower pot 😅
They’re moIna! They look exactly like the picture halfway down this page: https://tropical-fish-keeping.com/moina-moina-macrocopa.html
I got a good in focus short right around 0:30 in the video. idk they look so much like these brine shrimp: https://www.swelluk.com/swell-live-artemia-brine-shrimp
They almost look like ants 🫠
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