Let me begin by saying I am not a pond / water garden person, my wife does all that. The pond is several years old (about 2,800 gal) with all sorts of plants and goldfish. Last month (but never before) something has begun eating the parrots feather and lily leafs, the lily leafs have little holes all in them and they have small green worms on them. Are the worms doing the eating and how can she get rid of them? All suggestions are welcomed.