My lily is growing very nicely, although I do see an issue. Several of the pads start to yellow and have holes in them. I thought that it was the koi nibbling and maybe it was normal for the pads to yellow after they were nibbled on. But today I cut off several of the yellowed pads, and examined them on the underside. There were many tiny 'worms', or maybe some type of parasite that is eating them. Now I see that they are also on my lower leaves of the cardinal plant too. They are too minute to even photograph with the camera I have. I do have pics here of the lily pad, upper and under sides. Any idea what they are, and if there is anything to do about them?