Algae ID - Dinos, right?

[artieg1]

I had a cyano outbreak, so used chemiclean, and the red slime is gone, and only this brown rust colored dust on the sand. See photo and microscope. Dinos, right? Something else?

Thanks!

 

[Snoopdog]

Well it is not stringy, but the microscope pictures are compelling. Can you get any closer?

 

[taricha]

Dinos, right?

right. Amphidinium, and something else. The larger ones may be gambierdiscus (rare).