My yard in Durham, NC, has the perfect place for a two-level water garden with a rock falls inbetween. I am a veteran gardener, but a novice with water gardens. I love the sound and sight of moving water, but hesitate (read, "chicken out") when it comes to installing water because of what seems like tremendous maintenance considerations...can anybody help me out with this? A "yay" or "nay", and, why...?