I have a very small elephant ear that I got from southern states a few days ago. It is in the bottom of three staggered bowls that empty into my container pond. The attendant told me that it was a marginal plant and would do well in a small amount of water, not fully submerged. She also said it would do well having small stones as a substrate instead of potting soil. I would have done soil, but the last bowl has multiple small holes drilled in it to allow for gradual drainage into the pond, so the rocks became a necessity. Any who, the elephant ear has begun to yellow. I'd like to save it before it's too late. What do I do?