Dino ID under microscope with microcritter id help

[zach_jb69]

Got Gino’s for a min. Nitrates around 5-10 nitrite 0 ammonia 0, ca 390 mg 1200 ph8.5.
don’t know phosphate don’t have a test:( (only comes w the 40$ kits and I already have 3 of the 4 in them(waste!)) so what kind of Dino’s r these and what have I found among them? I uploaded videos though I’m not sure if you can view them

 

[dwest]

I think I see the sesame seed shape of ostreopsis. I can’t see the videos on my iPad.

https://www.reef2reef.com/threads/dinoflagellate-identification-guide.671466/

 

[taricha]

ostreopsis and a nematode