Hi, I have a small pond, about 10 years old and badly maintained. We are now wanting to re-develop, clean, new pump etc but the pond has water lily, huge leaves which grows so big that it come out of the pond and very health looking, beautiful white flowers. We don't really know what is maintaining it as we never have done anything to it. We are a bit scare of doing something that it will disturb the water lily. Any thoughts will be much appreciated.