Before taking out what you have, consider if can be developed as a wetland. Have the lotus bloomed? It is possible that they just need fertilizer and may be a very nice variety. Just added "The President" variety of lotus to my new pond. If it is within your budget, consider stone as a replacement for the deck and pathways, or concrete made to look like stone. My bodies of water are primarily wildlife habitat, but the fish do fine too, and swimming is also fun. It really is all about what you enjoy. If possible, a deeper area might be added adjacent to what is already there.
