I have weeds in my lake, I assume they are a type of water lilly, but I am not sure. All of the water lillies I have known have much larger leaves. They have oval leaves , about 2-3 inches wide that float on the surface. The underside of the leaf is a dark red color, and the stem is red with an odd clear coating. They spread very quickly. I don't mind a few for cover but they are going to take over quickly if something isn't done. I was hoping there was something I could do to control them without herbacide(grass carp, talapia etc.)