I beat them by raising PO4 and NO3 a lot. Like NO3 25 and PO4 0.2. Also run a UV sterilizer to/from the display 24/7. Pretty soon the algae will beat the dinos and then ou reduce PO4 and NO3 back to normal levels. Your PO4 seems a bit low now. You basically have to outcompete the dinos and algae will do that. You just have to feed it. Consider dosing NO3 and PO4 to raise your levels. Also manually remove as many dinos as you can everyday. It sucks be eventually you’ll beat them back.