Just read all 4 pages of the "Muck Eating Bacteria Experiment" seems that aquatic plants grow because they have nutrients (yup, call me captain obvious). So reducing the nutrients or muck will reduce the plants.
Grass Carp would be awesome but they are restricted here in NC. Maybe some Tilapia & Catfish. Also seems like an aeration system would be quite helpful.
Got tied up with home repairs so I brought in a "profesional pond maintenance outfit" They sprayed some Habitat around which seems to have helped a lot. Helped so much we now have a few Heron that stop by for breakfast.
Sadly one of the Heron suffered a stroke or some other malaise so it moved on from hunter to feed stock for another predator.
The warning label on those herbicides scares the daylights out of me. I am 6 years in remission from Lyphoma so a bit more cautious with those warnings.
We use these what we call space suits at work. They r really pretty cheap. We get them by the case. Surely they can be bought just one somewhere. I'm not promoting this product in particular just the style.