Sorry to disagree...but you have your information backwards. Nitrogen fertilization will promote the desirable micro-algae, and Phosphorus fertilization encourages FA and macrophytic algae. Typically, you want 10-200x more N than P in your fertilization additions to make good blooms to produce food chain plankton organisms for fish fry. Check any of the numerous references by David Culver at Ohio State for more specifics. If you can't use white amur to consume the FA (at stocking rates of 15-30/acre), then stick with blue pond dye to shade out some of it.
---Dr. Dave
