Onemean, I have one plant in my koi pond that keeps getting beaten up. Not sure if the fish are eating or picking at it or what. They seem to leave my lilies alone, but this plant is from a lake, and I think it's a wild lotus, but still have not seen a bud open, think the fish demolish it before it can open. Going to move it to the goldfish pond and see if it does better there. I agree with Addy, put flat rocks on top of the tuber to hold it down in the clay. If the fish are mating, that will stop in the next month or so, and the lilies should recover and do better.