You have receipted lots of good advice here.
As Tiffany has suggested, fertilizing in general is vastly overrated and can be skipped altogether in most instances. More specifically, fertilizer sticks tend to create fertilizer "hot spots" where they are inserted and that can burn tender roots. If possible, do try to remove any that you have already inserted.
How is your Bird's Nest Fern potted? Is it still in its original plastic pot? Is it possible that water is accumulating in the bottom of the brass planter? How it is planted will have an effect on how it should be watered.
