Are these dinos? Thanks for helping!

[JulieO]

 

[taricha]

I see no dinos here. I see a lot of diatoms, maybe some thin strand cyanobacteria holding the mass together. A central GHA filament everything is grouped around and small fast cells that are probably cryptomonas or similar...

These are not a dino. They are another random harmless flagellate. Something like a cryptomonas / rhodomonas.
Here they are in a couple of vids from my system, shape and movement a lot like yours:

(Close-up):

 

[JulieO]

Thank you for helping!