Well put me in the minority, but I feed Rod's Original food as the staple diet and do not have an increase in phosphates. I do run GFO. Not sure if it is marketting shill, but they have said their food does not need to be rinsed and does not contribute an extra phosphates compared to other frozen foods.
All I can say is in my situation I do not have microalgae growth or an increase in phosphates while feeding Rod's almost every day (and running GFO).
Of course, maybe you guys are just referring to Rod's Coral Blend and then I'd look stoopid