It can be tricky trying to tell the “good weeds” from the invasive species weeds so we put together a chart to help you with Northern Water Milfoil verses Eurasian Water Milfoil identification and Coon Tail verses Curly Leaf Pondweed identification.
Also, if you see either of these invasive species, you can hand pull or rake the plants but be careful to remove all fragments from the water and the shore. The plants can then be used as garden mulch but only a good distance from the shore.
Identification Guides: Good Weed or Bad Weed?
http://lakejohnassociation.com/wp-content/uploads/2018/01/Good-Weed-or-Bad-with-Photos.pdf