I don't mean to contradict. But dinos come in multiple colors. As the Does cyano. Multiple tanks that I've known with excessively low nutrients, that is unmeasurable phosphate and nitrate still carry and have issues with dinos.When I had dinos I tried every accepted cure there is to no avail. The only thing that made it go away was Excessive Removal. Siphoning it out every 20 to 30 minutes for about 3 weeks before it stopped returning
I know that cyano and dinos come in numerous colors and forms. The small amounts of reddish brown stuff on some of my corals and rock looked like cyano (thru a magnifying glass). However, my QT tank has dark brown stuff that I originally thought was just brown algae but the snails and fish won't touch it, then I realized it is parasitic so it's probably a species of dino, too. It looks similar to cyano from a distance but not close up. Definitely different from the stuff I had identified as cyano. But I could be wrong, absolutely.
My point about dosing nitrates, which killed the snotty brown dinos in my tank, is that natural sea water has much higher concentrations of nitrates than phosphates, assuming the sample isn't taken in a polluted nearshore area. My sps tank had virtually no nitrates and no or extremely low phosphates (less than 0.03) because they were being used up by dinos. So compared to natural sea water, the nutrient levels in my tank were way out of balance. When I started dosing nitrate, IMO, the corals were then able to outcompete the dinos. Or maybe dinos just don't thrive with higher nitrate levels, although I only raised my nitrates to approx. 2ppm.
