I had dinos because a ran an ULNS. The way I beat them was by keeping my PO4 at least 0.1 ppm and NO3 at least 1 ppm for 6 months with a reduced photo period. From 14 hours down to 6. I had them so bad it looked like my tank was covered in snot. After 3 months they were about 90% gone. Took another 3 months to completely go away. I also ran GAC for the toxins and did manual removal once or twice a week with a baster. I now subscribe to the dirty water mindset. My dinos never bloomed again. It takes patience to reverse this.