Sadly, that does have the look of dinos or chrysophytes. If you can get a pic through a microscope, we can better identify exactly what it is.
Start by raising your nitrates around 5-10ppm and phosphates around 0.06-0.10ppm by dosing these items or reducing your nutrient export...ie: shutting off the skimmer, reducing chaeto in a refugium, etc... It isn't a fast fix in any regard...but a few types of dinos are easier to control than others.