Thanks for all the responses so far. Coontail, if controlled, is actually a good oxygenator and fish food. Right now it is way too much and it fouls the prop on our trolling motor in many parts of the pond and makes fishing impossible unless you're trying to get your coontail limit. The hope with the islands is that they'll take up nutrients faster than the native plants in the pond and allow me time to harvest much of the coontail. It is challenging dealing with the evolving nature of the pond, and more importantly, knowing where to spend your money to get the best affect. I definitely haven't given up on aeration, but now I am going to more actively move diffusers to try and work off muck in different areas of the pond. Thanks again and hope y'all have a great Thanksgiving!

Brian