I got this lovely plant as a gift. I have it in a dark corner that has some bright light indirectly coming around a corner. It was healthy before I went away on vacation. Then I believe it was allowed to dry out too much and ever since I cannot keep the leaves from getting ragged brown edges which eventually turn the whole leaf brown. I have fed the plant Osmocote and water several times a week. I need some suggestions on what else I may do. If I leave it without water for 3 days or more, it wilts.