I could use your help IDing.
Tank has been up about 6 months.
Redsea 425
Nitrate 6.5
Phosphate.08
I dose phyto daily.
Biodigest, Microbactor, and AF Life Source weekly.
That’s dinoflagellates most likely. I’d say low phosphate but the numbers you listed are good. Just going through the uglies. If you could get a sample on a microscope and really see what type it is, there are forums that tell you how to get rid of each type.