I got the Amscope 150C got it on sale great microscope. I thought had Dinos but actually where Chrysophytes. Yes, a microscope can help. It's kind of cool as well to see whats actually in your water.
My battle with Chrysophytes was take as much out as possible; siphon, etc. no lights 2 days; got a UV light; got more cleanup critters. So far so good.
I will say you have what I have. However, just a guess with no microscope. One way to tell is use Vibrant if it clears up most likely you have Chrysophytes